Aircraft N21723 Data
3
aircraft records found
N21723
1999 Boeing 737-724, c/n 28790
Latest photos of N21723
MarkKalfas
@ KORD
Mark Kalfas
@ KORD
Mark Kalfas
@ KORD
Mark Kalfas
@ KORD
Recent Routes
NO LIVE DATA
United Airlines
| Time | Callsign | FL | Speed | Heading | Route |
|---|---|---|---|---|---|
| 2026-10-22 17:50 UTC | UAL2190 / UA2190 | FL3 | 139 kt | 90° | — |
| 2026-10-22 13:50 UTC | UAL1077 / UA1077 | FL-2 | 105 kt | 357° |
ORD → DCA
ORD
→
DCA
Chicago O'hare International Airport → Ronald Reagan Washington Ntl Airport |
| 2026-10-22 10:40 UTC | UAL2112 / UA2112 | — | 1 kt | 98° |
CLE → ORD
CLE
→
ORD
Cleveland-hopkins International Airport → Chicago O'hare International Airport |
| 2026-10-22 04:04 UTC | UAL457 / UA457 | — | 8 kt | 93° |
ORD → CLE
ORD
→
CLE
Chicago O'hare International Airport → Cleveland-hopkins International Airport |
| 2026-10-22 01:38 UTC | UAL1009 / UA1009 | — | 5 kt | 90° |
SBA → ORD
SBA
→
ORD
Santa Barbara Municipal Airport → Chicago O'hare International Airport |
| 2026-10-21 19:22 UTC | UAL1008 / UA1008 | — | 1 kt | 90° |
LGA → ORD
LGA
→
ORD
Laguardia Airport → Chicago O'hare International Airport |
| 2026-10-21 12:52 UTC | UAL2063 / UA2063 | — | 6 kt | 121° | — |
| 2026-10-21 03:04 UTC | UAL2351 / UA2351 | FL6 | 141 kt | 182° | — |
| 2026-10-20 23:36 UTC | UAL2747 / UA2747 | — | 16 kt | 90° | — |
| 2026-10-20 20:24 UTC | UAL580 / UA580 | FL4 | 137 kt | 43° | — |
| 2026-10-20 17:34 UTC | UAL2207 / UA2207 | — | 17 kt | 90° |
PHL → ORD
PHL
→
ORD
Philadelphia International Airport → Chicago O'hare International Airport |
| 2026-10-20 14:02 UTC | UAL2856 / UA2856 | — | 12 kt | 245° |
ORD → PHL
ORD
→
PHL
Chicago O'hare International Airport → Philadelphia International Airport |
| 2026-10-20 01:38 UTC | UAL1476 / UA1476 | — | 12 kt | 180° | — |
| 2026-10-19 19:54 UTC | UAL1920 / UA1920 | — | 3 kt | 124° |
STL → ORD
STL
→
ORD
St Louis Lambert International Airport → Chicago O'hare International Airport |
| 2026-10-19 16:52 UTC | UAL1044 / UA1044 | — | 4 kt | 183° |
ORD → STL
ORD
→
STL
Chicago O'hare International Airport → St Louis Lambert International Airport |
| 2026-10-19 14:30 UTC | UAL2792 / UA2792 | — | 12 kt | 188° |
STL → ORD
STL
→
ORD
St Louis Lambert International Airport → Chicago O'hare International Airport |
| 2026-10-19 02:06 UTC | UAL1625 / UA1625 | — | 3 kt | 245° |
AUS → ORD
AUS
→
ORD
Austin-bergstrom International Airport → Chicago O'hare International Airport |
| 2026-10-18 23:40 UTC | UAL654 / UA654 | — | 8 kt | 177° |
DCA → ORD
DCA
→
ORD
Ronald Reagan Washington Ntl Airport → Chicago O'hare International Airport |
| 2026-10-18 01:10 UTC | UAL643 / UA643 | FL1 | 141 kt | 270° |
LAS → SFO
LAS
→
SFO
Harry Reid International Airport → San Francisco International Airport |
| 2026-10-17 20:50 UTC | UAL1533 / UA1533 | FL0 | 139 kt | 208° | — |
| 2026-10-17 15:44 UTC | UAL2052 / UA2052 | FL0 | 132 kt | 90° | — |
| 2026-10-17 04:42 UTC | UAL1794 / UA1794 | FL6 | 127 kt | 359° | — |
| 2026-10-17 02:24 UTC | UAL282 / UA282 | FL1 | 129 kt | 270° | — |
| 2026-10-17 00:46 UTC | UAL1711 / UA1711 | — | 0 kt | 90° |
SFO → LAS
SFO
→
LAS
San Francisco International Airport → Harry Reid International Airport |
| 2026-10-16 19:52 UTC | UAL2026 / UA2026 | FL2 | 148 kt | 270° | — |
| 2026-10-16 16:48 UTC | UAL2256 / UA2256 | — | 3 kt | 321° | — |
| 2026-10-16 02:20 UTC | UAL1678 / UA1678 | FL4 | 135 kt | 89° |
SFO → DCA
SFO
→
DCA
San Francisco International Airport → Ronald Reagan Washington Ntl Airport |
| 2026-10-15 22:20 UTC | UAL625 / UA625 | — | 14 kt | 357° | — |
| 2026-10-15 17:32 UTC | UAL1089 / UA1089 | FL4 | 136 kt | 90° | — |
| 2026-10-15 14:26 UTC | UAL1024 / UA1024 | — | 15 kt | 239° | — |
| 2026-10-15 11:08 UTC | UAL2260 / UA2260 | FL2 | 135 kt | 89° |
SFO → SAN
SFO
→
SAN
San Francisco International Airport → San Diego International Airport |
| 2026-10-15 03:42 UTC | UAL1183 / UA1183 | — | 10 kt | 267° | — |
| 2026-10-14 15:20 UTC | UAL2460 / UA2460 | FL4 | 142 kt | 90° | — |
| 2026-10-14 04:48 UTC | UAL8172 / UA8172 | — | 1 kt | 217° | — |
| 2026-10-13 23:02 UTC | UAL1853 / UA1853 | FL4 | 141 kt | 89° | — |
| 2026-10-13 20:50 UTC | UAL1852 / UA1852 | — | 8 kt | 222° | — |
| 2026-10-12 01:18 UTC | UAL2114 / UA2114 | FL4 | 127 kt | 90° | — |
| 2026-10-11 23:24 UTC | UAL8199 / UA8199 | — | 10 kt | 270° | — |
| 2026-10-11 20:18 UTC | UAL8135 / UA8135 | FL3 | 144 kt | 90° | — |
| 2026-10-11 16:18 UTC | UAL591 / UA591 | — | 0 kt | 352° |
EWR → SAT
EWR
→
SAT
Newark Liberty International Airport → San Antonio International Airport |
| 2026-10-11 00:10 UTC | UAL799 / UA799 | FL22 | 170 kt | 23° |
DEN → MCO
DEN
→
MCO
Denver International Airport → Orlando International Airport |
| 2026-10-10 20:10 UTC | UAL780 / UA780 | — | 1 kt | 352° |
IAD → PDX
IAD
→
PDX
Washington Dulles International Airport → Portland International Airport |
| 2026-10-10 17:42 UTC | UAL1709 / UA1709 | FL5 | 145 kt | 230° |
BNA → IAD
BNA
→
IAD
Nashville International Airport → Washington Dulles International Airport |
| 2026-10-10 14:58 UTC | UAL471 / UA471 | — | 16 kt | 270° |
IAD → ATL
IAD
→
ATL
Washington Dulles International Airport → Hartsfield/jackson Atlanta International Airport |
| 2026-10-10 01:34 UTC | UAL1869 / UA1869 | — | 10 kt | 222° |
IAD → SAT
IAD
→
SAT
Washington Dulles International Airport → San Antonio International Airport |
| 2026-10-09 20:38 UTC | UAL1019 / UA1019 | — | 18 kt | 90° | — |
| 2026-10-09 18:14 UTC | UAL2631 / UA2631 | FL5 | 141 kt | 327° |
BOS → ORD
BOS
→
ORD
General Edward Lawrence Logan International Airport → Chicago O'hare International Airport |
| 2026-10-09 14:52 UTC | UAL2465 / UA2465 | — | 8 kt | 17° |
BNA → ORD
BNA
→
ORD
Nashville International Airport → Chicago O'hare International Airport |
| 2026-10-09 01:24 UTC | UAL739 / UA739 | — | 12 kt | 312° |
ORD → BNA
ORD
→
BNA
Chicago O'hare International Airport → Nashville International Airport |
| 2026-10-08 22:06 UTC | UAL1087 / UA1087 | — | 7 kt | 323° | — |
| 2026-10-08 19:22 UTC | UAL1687 / UA1687 | FL8 | 155 kt | 224° | — |
| 2026-10-08 16:14 UTC | UAL697 / UA697 | FL3 | 134 kt | 91° | — |
| 2026-10-08 01:46 UTC | UAL1627 / UA1627 | — | 7 kt | 262° |
SFO → LAS
SFO
→
LAS
San Francisco International Airport → Harry Reid International Airport |
| 2026-10-07 22:00 UTC | UAL1532 / UA1532 | FL5 | 140 kt | 89° |
ORD → MSY
ORD
→
MSY
Chicago O'hare International Airport → Louis Armstrong New Orleans International Airport |
| 2026-10-07 19:22 UTC | UAL2468 / UA2468 | — | 43 kt | 107° |
EWR → MSY
EWR
→
MSY
Newark Liberty International Airport → Louis Armstrong New Orleans International Airport |
| 2026-10-07 14:52 UTC | UAL1307 / UA1307 | — | 13 kt | 295° |
KMA1 → EWR
KMA1 →
EWR
KMA1 → Newark Liberty International Airport |
| 2026-10-07 12:32 UTC | UAL593 / UA593 | — | 11 kt | 301° |
EWR → BOS
EWR
→
BOS
Newark Liberty International Airport → General Edward Lawrence Logan International Airport |
| 2026-10-04 01:10 UTC | UAL2325 / UA2325 | — | 0 kt | 186° | — |
| 2026-10-03 21:38 UTC | UAL1391 / UA1391 | FL2 | 132 kt | 70° | — |
| 2026-10-03 17:56 UTC | UAL2104 / UA2104 | — | 1 kt | 186° |
KMA1 → EWR
KMA1 →
EWR
KMA1 → Newark Liberty International Airport |
| 2026-10-03 15:00 UTC | UAL375 / UA375 | — | 21 kt | 200° |
EWR → BOS
EWR
→
BOS
Newark Liberty International Airport → General Edward Lawrence Logan International Airport |
| 2026-10-03 12:02 UTC | UAL2828 / UA2828 | — | 0 kt | 186° |
EWR → LAS
EWR
→
LAS
Newark Liberty International Airport → Harry Reid International Airport |
| 2026-10-03 02:46 UTC | UAL2645 / UA2645 | FL4 | 133 kt | 90° | — |
| 2026-10-03 00:02 UTC | UAL555 / UA555 | — | 1 kt | 321° |
BOS → EWR
BOS
→
EWR
General Edward Lawrence Logan International Airport → Newark Liberty International Airport |
| 2026-10-02 21:30 UTC | UAL1536 / UA1536 | — | 1 kt | 287° |
EWR → BOS
EWR
→
BOS
Newark Liberty International Airport → General Edward Lawrence Logan International Airport |
| 2026-10-02 01:06 UTC | UAL1559 / UA1559 | — | 3 kt | 186° | — |
| 2026-10-01 18:14 UTC | UAL1304 / UA1304 | FL2 | 137 kt | 208° | — |
| 2026-10-01 12:18 UTC | UAL660 / UA660 | — | 8 kt | 318° |
ORD → SAN
ORD
→
SAN
Chicago O'hare International Airport → San Diego International Airport |
| 2026-09-30 23:46 UTC | UAL2825 / UA2825 | FL-2 | 134 kt | 256° |
ORD → PHL
ORD
→
PHL
Chicago O'hare International Airport → Philadelphia International Airport |
| 2026-09-30 20:10 UTC | UAL1888 / UA1888 | — | 8 kt | 284° |
DCA → ORD
DCA
→
ORD
Ronald Reagan Washington Ntl Airport → Chicago O'hare International Airport |
| 2026-09-30 16:50 UTC | UAL1904 / UA1904 | — | 7 kt | 357° |
ORD → DCA
ORD
→
DCA
Chicago O'hare International Airport → Ronald Reagan Washington Ntl Airport |
| 2026-09-30 13:48 UTC | UAL441 / UA441 | — | 8 kt | 307° |
DCA → ORD
DCA
→
ORD
Ronald Reagan Washington Ntl Airport → Chicago O'hare International Airport |
| 2026-09-30 02:36 UTC | UAL2160 / UA2160 | FL-2 | 131 kt | 356° |
DEN → DFW
DEN
→
DFW
Denver International Airport → Dallas-fort Worth International Airport |
| 2026-09-29 22:04 UTC | UAL2458 / UA2458 | — | 9 kt | 191° |
ORD → LGA
ORD
→
LGA
Chicago O'hare International Airport → Laguardia Airport |
| 2026-09-29 17:58 UTC | UAL2176 / UA2176 | FL360 | 452 kt | 281° |
GSP → ORD
GSP
→
ORD
Greenville Spartanburg International Airport → Chicago O'hare International Airport |
| 2026-09-29 12:18 UTC | UAL2684 / UA2684 | — | 5 kt | 188° |
ORD → ATL
ORD
→
ATL
Chicago O'hare International Airport → Hartsfield/jackson Atlanta International Airport |
| 2026-09-29 01:46 UTC | UAL1719 / UA1719 | FL9 | 131 kt | 297° | — |
| 2026-09-28 22:28 UTC | UAL1851 / UA1851 | — | 16 kt | 90° | — |
| 2026-09-28 19:44 UTC | UAL1595 / UA1595 | FL8 | 149 kt | 29° | — |
| 2026-09-28 05:48 UTC | UAL1517 / UA1517 | — | 12 kt | 295° |
DFW → ORD
DFW
→
ORD
Dallas-fort Worth International Airport → Chicago O'hare International Airport |
| 2026-09-28 02:42 UTC | UAL793 / UA793 | — | 8 kt | 270° |
ORD → DFW
ORD
→
DFW
Chicago O'hare International Airport → Dallas-fort Worth International Airport |
| 2026-09-27 22:32 UTC | UAL2138 / UA2138 | — | 10 kt | 11° |
ORD → SAN
ORD
→
SAN
Chicago O'hare International Airport → San Diego International Airport |
| 2026-09-27 18:26 UTC | UAL1297 / UA1297 | FL7 | 137 kt | 82° | — |
| 2026-09-27 00:24 UTC | UAL2304 / UA2304 | — | 3 kt | 98° |
EWR → ATL
EWR
→
ATL
Newark Liberty International Airport → Hartsfield/jackson Atlanta International Airport |
| 2026-09-26 19:58 UTC | UAL752 / UA752 | — | 6 kt | 264° |
ORD → DCA
ORD
→
DCA
Chicago O'hare International Airport → Ronald Reagan Washington Ntl Airport |
| 2026-09-26 16:10 UTC | UAL1215 / UA1215 | — | 18 kt | 90° | — |
| 2026-09-25 21:34 UTC | UAL1634 / UA1634 | FL4 | 134 kt | 358° |
DFW → ORD
DFW
→
ORD
Dallas-fort Worth International Airport → Chicago O'hare International Airport |
| 2026-09-25 14:24 UTC | UAL539 / UA539 | — | 8 kt | 270° |
ORD → DFW
ORD
→
DFW
Chicago O'hare International Airport → Dallas-fort Worth International Airport |
| 2026-09-24 14:18 UTC | UAL1955 / UA1955 | — | 12 kt | 0° |
ATL → ORD
ATL
→
ORD
Hartsfield/jackson Atlanta International Airport → Chicago O'hare International Airport |
| 2026-09-24 02:36 UTC | UAL1020 / UA1020 | — | 0 kt | 270° | — |
| 2026-09-23 20:04 UTC | UAL1673 / UA1673 | FL5 | 131 kt | 51° |
ORD → DFW
ORD
→
DFW
Chicago O'hare International Airport → Dallas-fort Worth International Airport |
| 2026-09-23 17:18 UTC | UAL2659 / UA2659 | — | 3 kt | 186° | — |
| 2026-09-23 14:38 UTC | UAL1365 / UA1365 | — | 18 kt | 45° |
ORD → BOS
ORD
→
BOS
Chicago O'hare International Airport → General Edward Lawrence Logan International Airport |
| 2026-09-22 22:02 UTC | UAL2693 / UA2693 | — | 10 kt | 276° |
SEA → IAD
SEA
→
IAD
Seattle-tacoma International Airport → Washington Dulles International Airport |
Live location data from OpenSky Network
Airframe Info
| Manufacturer | Boeing |
| Model | 737-724 Search all Boeing 737-724 |
| Year built | 1999 |
| Construction Number (C/N) | 28790 |
| Aircraft Type | Fixed wing multi engine |
| Number of Seats | 149 |
| Number of Engines | 2 |
| Engine Type | Turbofan |
| Engine Manufacturer and Model | CFM International CFM56-7B2 |
Aircraft
| Registration Number | N21723 |
| Mode S (ICAO24) Code | a1d63d |
| Certification Class | Standard |
| Certification Issued | 1999-04-23 |
| Air Worthiness Test | 1999-04-21 |
| Last Action Taken | 2025-11-03 |
| Current Status | Valid |
Owner
| Registration Type | Corporation |
| Owner | UNITED AIRLINES INC |
| Address |
233 S Wacker Dr Chicago, IL 606067147 United States |
| Region | Great Lakes |
N21723
1940 Heideman-bowlus B-3, c/n 3
Airframe Info
| Manufacturer | Heideman-bowlus |
| Model | B-3 Search all Heideman-bowlus B-3 |
| Year built | 1940 |
| Construction Number (C/N) | 3 |
| Number of Seats | 2 |
Aircraft
| Registration Number | N21723 |
| Mode S (ICAO24) Code | a1d63d |
| Certification Issued | 1958-12-16 |
| Current Status | Deregistered |
| Registration Cancel Date | 1967-06-29 |
Owner
| Registration Type | Individual |
| Address |
El Cajon, CA 92021 United States |
| Region | Western-Pacific |
N21723
Piper PA-31-350, c/n 318152028
Airframe Info
| Manufacturer | Piper |
| Model | PA-31-350 Search all Piper PA-31-350 |
| Construction Number (C/N) | 318152028 |
| Number of Seats | 8 |
| Number of Engines | 2 |
Aircraft
| Registration Number | N21723 |
| Mode S (ICAO24) Code | a1d63d |
| Certification Issued | 1994-08-02 |
| Last Action Taken | 1994-08-03 |
| Current Status | Deregistered |
| Registration Cancel Date | 1994-12-02 |
Owner
| Registration Type | Corporation |
| Owner | SPECIAL AIR SERVICE CORP |
| Address |
Miami, FL 33176 United States |