Allegheny Airlines was an airline operated out of Pittsburgh Pennsylvania from 1952 to 1979.
Allegheny Airlines was born as the "All American Aviation Company". The business was founded by the Du Pont brothers Richard and Alexis in 1939.
In 1949, the company was renamed All American Airways as it switched from airmail to passenger service. The 1950s was of significant growth for the airline and the name "Allegheny Airlines" was created.

In early 1960 Allegheny added the Convair 540 turboprop to its fleet. The aircraft was unreliable with engine problems. Shortly thereafter, the airline switched to General Motors turboprops with the the Convair 580. This was a great aircraft and accounted for a huge part of the airline's growth.

Allegheny Airlines also became one of the first airlines to create a branded network of regional airline carriers operating in unison with Allegheny. This was called the Allegheny Commuter System.

Also contributing to Allegheny’s growth were the acquisitions of regional carriers Lake Central Airlines in 1968 and Mohawk Airlines in 1972.

As deregulation came upon the airline industry, Allegheny looking to shed its image, changed its name to USAir on October 28, 1979.

After Allegheny Airlines rebranded itself as USAir as airline deregulation took effect, the company kept its earlier name for its Allegheny Commuter service, later renamed “US Airways Express”.
It primarily flew De Havilland Canada Dash 8 turboprop aircraft serving 35 destinations in the northeastern United States from hubs in Boston and Philly.
Its operations and the Dash 8 fleet were incorporated into Piedmont Airlines in 2004 to consolidate operations and costs. Today an Airbus A319 aircraft (N745VJ) of US Airways is painted in Allegheny colors.

Allegheny Airlines Fleet
| Aircraft |
From |
To |
Fleet |
| Douglas DC-3 |
1953 |
1966 |
24 |
| Martin 202 |
1955 |
1966 |
18 |
| Convair 540 |
1959 |
1963 |
5 |
| Convair 340 |
1960 |
1967 |
17 |
| Convair 440 |
1962 |
1974 |
27 |
| Fokker F27 |
1965 |
1974 |
27 |
| Convair 580 |
1965 |
1978 |
40 |
| Douglas DC-9-30 |
1966 |
1979 |
89 |
| Douglas DC-9-50 |
1974 |
1978 |
8 |
| Nord 262 |
1968 |
1977 |
13 |
| Boeing 727-200 |
1970 |
1971 |
2 |
| Boeing 727-100 |
1978 |
1979 |
11 |
| BAC 1-11 |
1972 |
1979 |
31 |
| Mohawk 298 |
1975 |
1979 |
9 |
|