| Tail Number / N-Number | N555CM |
| Manufacturer | ROBINSON HELICOPTER |
| Model | R44 II |
| Year Built | 2019 |
| Manufacturer's Serial Number | 14290 |
| 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 | LLC |
| Owner Name | SSR AVIATION LLC |
| Street | 8455 LENEXA DR |
| City | OVERLAND PARK |
| State | KS |
| Zip Code | 66214-1550 |
| Region | Central |
| County | Johnson County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2019-01-17 |
| Certificate Issue Date | 2019-03-08 |
| Last Action Date | 2021-10-13 |
| Expiration Date | 2029-03-31 |
| Status | Valid Registration |
| Mode S Code | 51611074 |
| Mode S Code Hex | A7123C |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N555CM.
| Tail Number / N-Number | N555CM |
| Manufacturer | CESSNA |
| Model | 421A |
| Year Built | 1969 |
| Manufacturer's Serial Number | 421A0023 |
| Aircraft Type | Fixed wing multi engine |
| 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 | CONT MOTOR |
| Engine Model | GTSIO-520-C |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 340 hp (254 kW) |
| Total Horsepower | 680 hp (507 kW) |
| Average Cruising Speed | 172 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | MERCER & GALLAGHER |
| Street | RR 1 BOX 208A |
| City | WEST |
| State | TX |
| Zip Code | 76691-9801 |
| County | Johnson County |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1969-01-22 |
| Certificate Issue Date | 2005-11-01 |
| Last Action Date | 2009-03-17 |
| Last Status | Registration Expired – Pending Cancellation |
| Cancellation Date | 2013-08-15 |