Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N521AU.
| Tail Number / N-Number | N521AU |
| Manufacturer | BOEING |
| Model | 737-3B7 |
| Year Built | 1988 |
| Manufacturer's Serial Number | 23856 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 149 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Engine Manufacturer | CFM INTL. |
| Engine Model | CFM56 SERIES |
| Engine Type | Turbo-fan |
| Number of Engines | 2 engines |
| Horsepower per Engine | 2,200 hp (1,641 kW) |
| Total Horsepower | 4,400 hp (3,282 kW) |
| Type of Registrant | Corporation |
| Owner Name | 737 PORTFOLIO TRUST |
| Street | ATTN CORP TRUST ADMINISTRATION 1100 NORTH MARKET ST |
| City | WILMINGTON |
| State | DE |
| Zip Code | 19890-0001 |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1988-02-10 |
| Certificate Issue Date | 2006-10-12 |
| Last Action Date | 2006-10-12 |
| Last Status | Valid Registration |
| Cancellation Date | 2007-05-04 |
| Exported To | MEXICO |
| Mode S Code | 51506270 |
| Mode S Code Hex | A68CB8 |