Highlands Airways has become the latest Scottish-based airline to go into administration.
The carrier served routes including Inverness to Stornoway and Cardiff to Anglesey.
The airline operated a mixture of scheduled passenger services, charter flights, and freight services including the delivery of newspapers to the Western Isles of Scotland.
According to the Highland Airways website the airline also carried oil crew to destinations including Cork, Shannon, Waterford, Bergen, Stavanger, Vagar (Faroes) Newquay and Stornoway during the summer season.
A statement from administrators PricewaterhouseCoopers said:
"All flight operations ceased with immediate effect and the CAA has been informed.
"Highland Airways, which employs approximately 100 people, operated a fleet of nine aircraft on various contracts including routes from Inverness and Oban to the Western Isles as well as Cardiff to Anglesey.
"The Company is in contact today with those passengers who had been expecting to travel in the coming weeks."
The news follows the ceasing of operations by Edinburgh-based Flyglobespan at the end of last year.