Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N921ES.
| Tail Number / N-Number | N921ES |
| Manufacturer | ROBINSON HELICOPTER |
| Model | R44 |
| Year Built | 2014 |
| Manufacturer's Serial Number | 13643 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | IO-540-A1A5 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 290 hp (216 kW) |
| Type of Registrant | LLC |
| Owner Name | AVIATION TRUST CO LLC TRUSTEE |
| Street | 3428 S LAKESIDE DR |
| City | OKLAHOMA CITY |
| State | OK |
| Zip Code | 73179-8428 |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2014-02-24 |
| Certificate Issue Date | 2018-10-04 |
| Last Action Date | 2018-10-04 |
| Last Status | Valid Registration |
| Cancellation Date | 2019-04-08 |
| Exported To | RUSSIAN FEDERATION |
| Mode S Code | 53141126 |
| Mode S Code Hex | ACC256 |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N921ES.
| Tail Number / N-Number | N921ES |
| Manufacturer | BELL HELICOPTER TEXTRON CANADA |
| Model | 407 |
| Year Built | 2009 |
| Manufacturer's Serial Number | 53966 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | ROLLS-ROYC |
| Engine Model | 250-C47B |
| Engine Type | Turbo-shaft |
| Number of Engines | 1 engine |
| Horsepower | 650 hp (485 kW) |
| Type of Registrant | Corporation |
| Owner Name | DS AVIATION 407 LLC |
| Street | 115 KINWEST PKWY STE 150 |
| City | IRVING |
| State | TX |
| Zip Code | 75063-3514 |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2009-09-14 |
| Certificate Issue Date | 2009-12-15 |
| Last Action Date | 2013-06-25 |
| Last Status | Valid Registration |
| Cancellation Date | 2013-09-23 |
| Exported To | CANADA |
| Mode S Code | 53141126 |
| Mode S Code Hex | ACC256 |