| Tail Number / N-Number | N638 |
| Manufacturer | FOCKE WULF |
| Model | 44J STIEGLITZ |
| Year Built | 1938 |
| Manufacturer's Serial Number | 638 |
| 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 | SIEMENS |
| Engine Model | SH14 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 113 hp (84 kW) |
| Average Cruising Speed | 129 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | AERO MOBIL INC |
| Street | 251 LITTLE FALLS DR |
| City | WILMINGTON |
| State | DE |
| Zip Code | 19808-1674 |
| Region | Eastern |
| County | New Castle County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1981-04-28 |
| Certificate Issue Date | 2012-05-16 |
| Last Action Date | 2021-05-05 |
| Expiration Date | 2028-05-31 |
| Status | Valid Registration |
| Mode S Code | 52055563 |
| Mode S Code Hex | A85B73 |
Deregistered Aircraft 1 of 3. This aircraft was previously assigned the N-number N638.
| Tail Number / N-Number | N638 |
| Manufacturer | SIKORSKY |
| Model | HSS-1 |
| Manufacturer's Serial Number | SS581144 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 14 seats |
| Weight Class | CLASS 2 (12,500 - 19,999 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 73 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | UNITED AIRCRAFT CORP |
| County | New Castle County |
| Certificate Issue Date | 1960-01-21 |
| Last Status | Valid Registration |
| Cancellation Date | 1960-08-10 |
| Exported To | JAPAN |
Deregistered Aircraft 2 of 3. This aircraft was previously assigned the N-number N638.
| Tail Number / N-Number | N638 |
| Manufacturer | LINCOLN STANDARD AIRCRAFT CO |
| Model | BIPLANE |
| Year Built | 1927 |
| Manufacturer's Serial Number | 47350 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 5 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Type of Registrant | Individual |
| Owner Name | WHITTEMORE FRED |
| Street | 4031 ALDRICH AVE N |
| City | MINNEAPOLIS |
| State | MN |
| Zip Code | 55412 |
| Region | Great Lakes |
| County | New Castle County |
| Certificate Issue Date | 1928-01-07 |
| Last Status | Valid Registration |
| Cancellation Date | 1928-09-08 |
Deregistered Aircraft 3 of 3. This aircraft was previously assigned the N-number N638.
| Tail Number / N-Number | N638 |
| Manufacturer | LINCOLN AIRCRAFT CO |
| Model | STANDARD 5 |
| Manufacturer's Serial Number | 103 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 3 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Type of Registrant | Individual |
| Owner Name | WHITTEMORE FRED |
| Street | 4031 ALDRICH AVE |
| City | MINNEAPOLIS |
| State | MN |
| Zip Code | 56701 |
| Region | Great Lakes |
| County | New Castle County |
| Last Status | Valid Registration |
| Cancellation Date | 1938-05-16 |