| Tail Number / N-Number | N121RG |
| Manufacturer | AIRBUS HELICOPTERS INC |
| Model | AS350B3 |
| Year Built | 2018 |
| Manufacturer's Serial Number | 8517 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 7 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | SAFRAN |
| Engine Model | ARRIEL 2D |
| Engine Type | Turbo-shaft |
| Number of Engines | 1 engine |
| Horsepower | 952 hp (710 kW) |
| Type of Registrant | Corporation |
| Owner Name | LONE STAR LAND & CATTLE CO |
| Street | 915 CONVICT GRADE ROAD |
| City | LIVINGSTON |
| State | MT |
| Zip Code | 59047 |
| Region | Northwest Mountain |
| County | Park County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2020-06-09 |
| Certificate Issue Date | 2020-11-13 |
| Last Action Date | 2021-01-28 |
| Expiration Date | 2027-11-30 |
| Status | Valid Registration |
| Mode S Code | 50054347 |
| Mode S Code Hex | A058E7 |
Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N121RG.
| Tail Number / N-Number | N121RG |
| Manufacturer | ROBINSON HELICOPTER COMPANY |
| Model | R44 II |
| Manufacturer's Serial Number | 11063 |
| 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-AE1A5 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 260 hp (194 kW) |
| Type of Registrant | Corporation |
| Owner Name | AIRCRAFT GUARANTY HOLDINGS & TRUST LLC TRUSTEE |
| Street | 515 N SAM HOUSTON PKWY E STE 305 |
| City | HOUSTON |
| State | TX |
| Zip Code | 77060-4023 |
| County | Park County |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2006-07-31 |
| Certificate Issue Date | 2006-07-24 |
| Last Action Date | 2006-08-23 |
| Last Status | Valid Registration |
| Cancellation Date | 2006-12-01 |
| Exported To | COLOMBIA |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N121RG.
| Tail Number / N-Number | N121RG |
| Manufacturer | GLASS RALPH E |
| Model | QUICKSILVER MXL |
| Manufacturer's Serial Number | 1217 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Type of Registrant | Individual |
| Owner Name | GLASS RALPH E |
| Street | 8860 HIGHLAND RD |
| City | BATON ROUGE |
| State | LA |
| Zip Code | 70808 |
| County | Park County |
| Country | US |
| Certificate Issue Date | 1985-07-18 |
| Last Action Date | 1991-10-19 |
| Last Status | A second attempt has been made at mailing a Triennial Aircraft Registration form to the owner with no response |
| Cancellation Date | 1996-01-19 |