Loganair has started operations as an independent airline for the first time in 25 years.
The move has brought competition to a number of routes in the Highlands and Islands.
Loganair has been operating as a franchise partner of Flybe, which will now compete with it through an alliance with Humberside-based Eastern Airways.
The routes affected include Glasgow to Stornoway and flights to Shetland from Edinburgh, Aberdeen and Glasgow. The airlines will also be flying from Aberdeen to Orkney.