N21723 — 1999 Boeing 737-724 Data
3
aircraft records found
N21723
1999 Boeing 737-724, c/n 28790
N21723 is a 1999 Boeing 737-724 (serial number 28790). It is configured with 2 engines and 149 seats. Registration status is listed as Valid, with ownership recorded under UNITED AIRLINES INC in Chicago, IL, United States. The profile includes 30 photos documenting this aircraft.
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 |
|---|---|---|---|---|---|
| 2026-11-11 20:28 UTC | UAL659T / UA659T | FL380 | 410 kt | 245° | — |
| 2026-11-11 15:16 UTC | UAL2620 / UA2620 | — | 12 kt | 0° |
ORD → MCO
ORD
→
MCO
Chicago O'hare International Airport → Orlando International Airport |
| 2026-11-11 02:30 UTC | UAL1989 / UA1989 | FL3 | 95 kt | 225° |
ORD → RDU
ORD
→
RDU
Chicago O'hare International Airport → Raleigh-durham International Airport |
| 2026-11-10 21:50 UTC | UAL1382 / UA1382 | — | 8 kt | 245° |
SLC → ORD
SLC
→
ORD
Salt Lake City International Airport → Chicago O'hare International Airport |
| 2026-11-10 17:50 UTC | UAL1972 / UA1972 | FL8 | 140 kt | 41° |
ORD → SLC
ORD
→
SLC
Chicago O'hare International Airport → Salt Lake City International Airport |
| 2026-11-10 13:20 UTC | UAL482 / UA482 | FL6 | 12 kt | 180° |
PHL → ORD
PHL
→
ORD
Philadelphia International Airport → Chicago O'hare International Airport |
| 2026-11-10 04:18 UTC | UAL1744 / UA1744 | — | 15 kt | 37° |
ORD → PHL
ORD
→
PHL
Chicago O'hare International Airport → Philadelphia International Airport |
| 2026-11-10 00:52 UTC | UAL1564 / UA1564 | — | 3 kt | 191° |
DFW → ORD
DFW
→
ORD
Dallas-fort Worth International Airport → Chicago O'hare International Airport |
| 2026-11-09 16:16 UTC | UAL2639 / UA2639 | — | 4 kt | 200° |
DFW → IAD
DFW
→
IAD
Dallas-fort Worth International Airport → Washington Dulles International Airport |
| 2026-11-09 02:44 UTC | UAL2116 / UA2116 | — | 8 kt | 270° |
IAD → DFW
IAD
→
DFW
Washington Dulles International Airport → Dallas-fort Worth International Airport |
| 2026-11-08 21:32 UTC | UAL2755 / UA2755 | — | 12 kt | 304° |
EWR → IAD
EWR
→
IAD
Newark Liberty International Airport → Washington Dulles International Airport |
| 2026-11-08 18:26 UTC | UAL560 / UA560 | — | 7 kt | 186° |
STL → EWR
STL
→
EWR
St Louis Lambert International Airport → Newark Liberty International Airport |
| 2026-11-08 14:26 UTC | UAL2673 / UA2673 | — | 3 kt | 205° |
EWR → STL
EWR
→
STL
Newark Liberty International Airport → St Louis Lambert International Airport |
| 2026-11-08 10:14 UTC | UAL2186 / UA2186 | — | 3 kt | 186° |
K10C → EWR
K10C
→
EWR
Galt Fld Airport → Newark Liberty International Airport |
| 2026-11-08 03:20 UTC | UAL1690 / UA1690 | FL0 | 136 kt | 208° |
EWR → SNA
EWR
→
SNA
Newark Liberty International Airport → John Wayne/orange County Airport |
| 2026-11-08 02:36 UTC | CYBRT P | FL400 | 450 kt | 242° | — |
| 2026-11-07 20:42 UTC | UAL1365 / UA1365 | — | 4 kt | 259° |
ORD → BOS
ORD
→
BOS
Chicago O'hare International Airport → General Edward Lawrence Logan International Airport |
| 2026-11-07 05:18 UTC | UAL282 / UA282 | FL26 | 190 kt | 301° |
IAD → SNA
IAD
→
SNA
Washington Dulles International Airport → John Wayne/orange County Airport |
| 2026-11-06 20:58 UTC | UAL1348 / UA1348 | — | 1 kt | 37° |
DEN → SEA
DEN
→
SEA
Denver International Airport → Seattle-tacoma International Airport |
| 2026-11-04 21:28 UTC | UAL358 / UA358 | — | 12 kt | 90° |
DFW → IAD
DFW
→
IAD
Dallas-fort Worth International Airport → Washington Dulles International Airport |
| 2026-11-03 21:08 UTC | UAL1322 / UA1322 | — | 0 kt | 23° |
SLC → IAD
SLC
→
IAD
Salt Lake City International Airport → Washington Dulles International Airport |
| 2026-11-03 06:18 UTC | UAL2775 / UA2775 | — | 2 kt | 174° |
EWR → SLC
EWR
→
SLC
Newark Liberty International Airport → Salt Lake City International Airport |
| 2026-11-03 00:26 UTC | UAL687 / UA687 | — | 4 kt | 259° | — |
| 2026-11-02 20:50 UTC | UAL1673 / UA1673 | FL6 | 131 kt | 230° |
ORD → DFW
ORD
→
DFW
Chicago O'hare International Airport → Dallas-fort Worth International Airport |
| 2026-11-02 01:48 UTC | UAL1559 / UA1559 | — | 1 kt | 186° | — |
| 2026-11-01 19:30 UTC | UAL1293 / UA1293 | — | 18 kt | 166° | — |
| 2026-11-01 13:40 UTC | UAL2805 / UA2805 | — | 5 kt | 104° |
ORD → MSP
ORD
→
MSP
Chicago O'hare International Airport → Minneapolis-st Paul Intl/wold-chamberlain Airport |
| 2026-11-01 03:34 UTC | UAL8110 / UA8110 | FL5 | 126 kt | 44° | — |
| 2026-11-01 01:30 UTC | UAL2657 / UA2657 | — | 16 kt | 90° |
ATL → ORD
ATL
→
ORD
Hartsfield/jackson Atlanta International Airport → Chicago O'hare International Airport |
| 2026-10-31 21:40 UTC | UAL1248 / UA1248 | — | 8 kt | 332° |
SFO → ORD
SFO
→
ORD
San Francisco International Airport → Chicago O'hare International Airport |
| 2026-10-31 17:50 UTC | UAL587 / UA587 | — | 2 kt | 135° |
ORD → IAD
ORD
→
IAD
Chicago O'hare International Airport → Washington Dulles International Airport |
| 2026-10-31 05:08 UTC | UAL308 / UA308 | FL0 | 132 kt | 208° |
PHL → ORD
PHL
→
ORD
Philadelphia International Airport → Chicago O'hare International Airport |
| 2026-10-30 15:10 UTC | UAL471 / UA471 | — | 6 kt | 200° |
IAD → ATL
IAD
→
ATL
Washington Dulles International Airport → Hartsfield/jackson Atlanta International Airport |
| 2026-10-30 01:12 UTC | UAL1869 / UA1869 | FL8 | 142 kt | 132° | — |
| 2026-10-29 20:22 UTC | UAL780 / UA780 | — | 1 kt | 0° |
IAD → PDX
IAD
→
PDX
Washington Dulles International Airport → Portland International Airport |
| 2026-10-29 18:02 UTC | UAL1709 / UA1709 | FL7 | 135 kt | 230° |
BNA → IAD
BNA
→
IAD
Nashville International Airport → Washington Dulles International Airport |
| 2026-10-28 23:54 UTC | UAL245 / UA245 | — | 16 kt | 309° |
IAD → BNA
IAD
→
BNA
Washington Dulles International Airport → Nashville International Airport |
| 2026-10-27 04:44 UTC | UAL326 / UA326 | FL0 | 138 kt | 208° | — |
| 2026-10-26 23:50 UTC | UAL1420 / UA1420 | FL3 | 136 kt | 90° | — |
| 2026-10-25 19:08 UTC | UAL2287 / UA2287 | FL0 | 150 kt | 135° | — |
| 2026-10-25 15:06 UTC | UAL646 / UA646 | — | 10 kt | 188° |
ORD → DEN
ORD
→
DEN
Chicago O'hare International Airport → Denver International Airport |
| 2026-10-25 01:28 UTC | UAL1401 / UA1401 | FL14 | 176 kt | 95° |
DFW → ORD
DFW
→
ORD
Dallas-fort Worth International Airport → Chicago O'hare International Airport |
| 2026-10-24 22:06 UTC | UAL1087 / UA1087 | — | 21 kt | 90° | — |
| 2026-10-24 19:34 UTC | UAL1687 / UA1687 | FL5 | 140 kt | 44° | — |
| 2026-10-24 15:44 UTC | UAL1586 / UA1586 | FL1 | 129 kt | 90° | — |
| 2026-10-24 03:46 UTC | UAL1678 / UA1678 | FL3 | 152 kt | 269° |
SFO → DCA
SFO
→
DCA
San Francisco International Airport → Ronald Reagan Washington Ntl Airport |
| 2026-10-24 00:02 UTC | UAL625 / UA625 | — | 10 kt | 177° | — |
| 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° |
DEN → 73CL
DEN
→
73CL
Denver International Airport → Julian Hinds Pump Plant Airstrip 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° |
SFO → LAX
SFO
→
LAX
San Francisco International Airport → Los Angeles International Airport |
| 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° |
AUS → ORD
AUS
→
ORD
Austin-bergstrom International Airport → Chicago O'hare 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° |
IAD → SJO
IAD
→
SJO
Washington Dulles International Airport → Juan Santamaría International Airport |
| 2026-10-17 04:42 UTC | UAL1794 / UA1794 | FL6 | 127 kt | 359° | — |
| 2026-10-17 00:46 UTC | UAL1711 / UA1711 | — | 0 kt | 90° |
AUS → EWR
AUS
→
EWR
Austin-bergstrom International Airport → Newark Liberty 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° | — |
| 2026-10-15 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° | — |
| 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° |
SFO → BOS
SFO
→
BOS
San Francisco International Airport → General Edward Lawrence Logan International Airport |
| 2026-10-13 23:02 UTC | UAL1853 / UA1853 | FL4 | 141 kt | 89° | — |
| 2026-10-13 20:50 UTC | UAL1852 / UA1852 | — | 8 kt | 222° |
MCO → SFO
MCO
→
SFO
Orlando International Airport → San Francisco 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 |