Aurigny has said Flybe's flights to Heathrow will have a "detrimental financial impact" on the Guernsey airline and will likely lead to a loss of passengers on its Gatwick route.
Currently Aurigny operates six daily services to London Gatwick, which the States designated as a lifeline route when it announced the ‘open skies’ policy.
This week Flybe has announced daily flights to London Heathrow, starting from March 31st.
The States is spending £800,000 on subsidising the trial service, while Aurigny's Gatwick route is not subsidised.
The airline outlines that it had a similar opportunity to provide a Heathrow service in November 2017, but says this did not happen due to a lack of financial support from Guernsey's Committee for Economic Development.