A new £24m four-year contract for the Scottish government-subsidised flights has been put out to tender.
The contract involves a number of new measures, including a cheaper fare for residents of Barra and also Tiree and neighbouring Coll.
A scheme which allows community councils in Barra to request additional flights on certain days will be expanded.
Medical reservations are also to be introduced for islanders on Tiree.
The contract is due to run from 25 October this year to 24 October 2027.
Loganair currently operates the public service obligation (PSO) routes.