Flybe, the airline that received government aid to avoid collapse, plans to drop its Newquay-Heathrow service in March.
He will replace it with flights from Newquay to London Gatwick Airport.
They arrive a few days after ministers said the airline should receive support because of its regional connectivity.
The change is expected to anger companies in the Southwest, who appreciate the range of international destinations provided by Heathrow.
“Heathrow puts you on the map when it comes to attracting internal investment,” said a regional development official.
Cornwall’s connections to London are considered important enough to make the route one of the few in the UK to be managed under a “public service obligation” contract.
This means that the government offers a subsidy for the route and invites bidders to manage it.
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The BBC understands that Flybe was speaking at Newquay airport about measures that could mitigate the effects of the change in Gatwick.
Senior industry sources said that the move decision was made and that the airline’s website has not sold flights from Newquay to Heathrow since late March.
The path will still be eligible for public subsidies.
Earlier this week, the government said it would conduct a review of regional connectivity as part of its “leveling” to spread economic growth in the regions.
The announcement was made at the same time as aid approved by ministers for Flybe, which is believed to focus on giving the airline time to pay around £ 100 million for exceptional passenger air travel.
Following the bailout agreement, the Department of Transportation said: “In light of these discussions, Flybe has confirmed that it will continue to operate normally, preserving flights to airports such as Southampton, Belfast and Birmingham.”
Flybe said he was working closely with his “partners through the network” to complete his full summer program. “Our future plans are reserved for businesses and are not yet ready for release,” he said.
Separately, the BBC has learned that Flybe, even from the end of March, will be free to divert many of the slots on the runways at Heathrow which it uses for domestic flights to other short-range services.
Flybe got the slots in 2017 as part of the “remedy” imposed by competition regulators on British Airways after purchasing BMI British Midland.
BA had to surrender to slots – which are highly valued, with pairs sold for £ 20 million or more – provided the new owner operated them on certain domestic routes.
Flybe is, however, free to switch to other short-haul routes since late March.
Industry sources said they could use those slots for European flights currently operated by its partner airlines – leaving one of its shareholders, Virgin Atlantic or its partner Delta Air Lines of America, the opportunity to start new services for a long time. ray from heathrow.