N21723 — 1999 Boeing 737-724
Active registrationChecked against FAA & NTSB records · as of Jul 16, 2026
N21723 has no NTSB accident records on file. Registration data compiled from public FAA records as of Jul 16, 2026.
Aircraft record
- Serial number
- 28790
- Manufacturer
- Boeing
- Model
- 737-724
- Year
- 1999
- Category
- Fixed wing multi-engine
- Engine
- Cfm Intl. Cfm56 Series
- Registration
- Active
- Registered to
- United Airlines Inc — Chicago, IL
Accident & incident history
No NTSB accident records on file.
Registration timeline
Ownership and registration events for this airframe (the 1999 Boeing 737-724).
- Apr 23, 1999registered — United Airlines Inc
Earlier aircraft on this N-number
The tail number N21723 was previously assigned to different aircraft. A registration number can be reused across unrelated airframes over decades — these are not the 1999 Boeing 737-724 above.
- until Dec 2, 1994Piper PA-31-350 (s/n 318152028)
- until Jun 29, 19671940 Heideman-bowlus B-3 (s/n 3)
Frequently asked
- Has N21723 been in an accident?
- No NTSB accident records are on file for N21723.
- What kind of aircraft is N21723?
- N21723 is a 1999 Boeing 737-724 (fixed wing multi-engine), serial number 28790.
- Who is N21723 registered to?
- N21723 is registered to United Airlines Inc of Chicago, IL. Registration status: active.
The full N21723 report
$12 $29 launch pricing
- Full NTSB investigation narratives — the complete text, not just the cause line
- Pre-buy question list generated from this aircraft’s actual records
- Complete registration & deregistration timeline, print-ready
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