A no-frills airline will typically cut overheads by flying from more remote airports (with lower access charges) and by using a single type of aircraft.
Whenever there was a turndown in the market for sewing thread, the overheads due to running numerous mills, each with its own management and administrative structure, was a liability.
The finer the granularity, the greater the potential for parallelism and hence speed-up, but the greater the overheads of synchronization and communication.
