| Tail Number / N-Number | N503B |
| Manufacturer | ROCKWELL INTERNATIONAL |
| Model | 690B |
| Manufacturer's Serial Number | 11503 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 11 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 2 engines |
| Average Cruising Speed | 192 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | ALLIANCE AIR PARTS INC |
| Street | PO BOX 950640 |
| City | OKLAHOMA CITY |
| State | OK |
| Zip Code | 73195-0640 |
| Region | Southwestern |
| County | Oklahoma County |
| Country | US |
| Fractional Ownership | No |
| Last Action Date | 2008-08-06 |
| Status | Valid Registration |
| Mode S Code | 51442456 |
| Mode S Code Hex | A6452E |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N503B.
| Tail Number / N-Number | N503B |
| Manufacturer | BEECH |
| Model | A35 |
| Manufacturer's Serial Number | D1525 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 120 miles per hour |
| Type of Registrant | Individual |
| Owner Name | WARDLOW BRAD K |
| Street | BOX 486 |
| City | CENTERVILLE |
| State | IA |
| Zip Code | 52544 |
| County | Oklahoma County |
| Country | US |
| Certificate Issue Date | 1978-04-12 |
| Last Action Date | 1991-12-21 |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |
| Cancellation Date | 1992-02-05 |