Lake Central's network in the 1950s extended from Chicago to Pittsburgh; in August 1953 it had scheduled flights to 21 airports, and in May 1968, this number increased to 39.

[3] 162 employees (65% of the total) bought 97.5% of the outstanding stock, 25% outright, and the rest financed over 24 months.

Allegheny later closed the Indianapolis base and sold the Nord 262s, which had proven unreliable.

DC-3 flights ended in 1967, and by spring of 1968 Lake Central had an all-turboprop fleet of Convair 580s and Nord 262s.

[5] Lake Central Airlines previously operated the following aircraft:[6] Shortly before the merger into Allegheny Airlines, Lake Central was serving the following cities with an all-turboprop fleet, mainly consisting of Convair 580 and Nord 262 aircraft, according to its April 28, 1968 timetable:[7]