Aurigny has ordered a new Embraer 195 to boost capacity on services between Guernsey and London Gatwick from next year.
The regional carrier has entered into an initial agreement to purchase the 122-seat aircraft, which is to be delivered by the Brazilian airframer in mid-2014.
The deal follows Flybe's decision to withdraw its Gatwick-Guernsey services from early 2014, leaving Aurigny as the market's only operator.
The States of Guernsey, which owns the airline, as agreed to act as a guarantor for the purchase after approving the airline's business case for the aircraft.
Flightglobal's Ascend Online database shows that the Channel Islands-based regional carrier operates a fleet of two ATR 72-500 turboprops and one ATR 72-200.