| Tail Number / N-Number | N25SM |
| Manufacturer | CESSNA |
| Model | 550 |
| Year Built | 1991 |
| Manufacturer's Serial Number | 550-0682 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 2 (12,500 - 19,999 pounds gross take off weight) |
| Engine Manufacturer | P&W CANADA |
| Engine Model | JT15D-4 |
| Engine Type | Turbo-fan |
| Number of Engines | 2 engines |
| Thrust per Engine | 2,500 pounds-force (11.1 kN) |
| Total Thrust | 5,000 pounds-force (22.2 kN) |
| Type of Registrant | LLC |
| Owner Name | SIDDONS MARTIN AVIATION LLC |
| Street | 1362 E RICHEY RD |
| City | HOUSTON |
| State | TX |
| Zip Code | 77073-3505 |
| Region | Southwestern |
| County | Harris County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1994-07-11 |
| Certificate Issue Date | 2022-02-08 |
| Last Action Date | 2022-02-24 |
| Expiration Date | 2029-02-28 |
| Status | Valid Registration |
| Mode S Code | 50453301 |
| Mode S Code Hex | A256C1 |
Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N25SM.
| Tail Number / N-Number | N25SM |
| Manufacturer | MADEY STEPHEN JR |
| Model | LONG EZ |
| Year Built | 2001 |
| Manufacturer's Serial Number | 1 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | 0-290 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 140 hp (104 kW) |
| Type of Registrant | Individual |
| Owner Name | MADEY STEPHEN L JR |
| Street | PO BOX 141 |
| City | HAGUE |
| State | VA |
| Zip Code | 22469-0141 |
| County | Harris County |
| Country | US |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2001-05-04 |
| Certificate Issue Date | 1995-08-29 |
| Last Action Date | 2008-10-22 |
| Last Status | Registration Expired – Pending Cancellation |
| Cancellation Date | 2013-05-01 |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N25SM.
| Tail Number / N-Number | N25SM |
| Manufacturer | BEECH |
| Model | E18S |
| Manufacturer's Serial Number | BA154 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 10 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 2 engines |
| Type of Registrant | Corporation |
| Owner Name | UNION FLIGHTS |
| Street | 6273 FREEPORT BLVD |
| City | SACRAMENTO |
| State | CA |
| Zip Code | 95822 |
| County | Harris County |
| Country | US |
| Certificate Issue Date | 1979-05-07 |
| Last Action Date | 1991-01-31 |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |
| Cancellation Date | 1991-05-01 |
| Exported To | CANADA |