EasyJet says it has begun consultations on plans to close bases at Stansted, Southend and Newcastle.
It follows an announcement by the airline that it may need to reduce staff numbers by up to a third because of the coronavirus pandemic.
The Unite union said nearly 1,300 UK crew members faced losing their jobs.
Pilots' union Balpa said it had been told by EasyJet that 727 of its UK-based pilots were at risk of redundancy.
That is equivalent to one in three of its pilots, Balpa said.
EasyJet chief executive Johan Lundgren said: "The lower demand environment means we need fewer aircraft and have less opportunity for work for our people.
"We are committed to working constructively with our employee representatives across the network with the aim of minimising job losses as far as possible."
However, Balpa general secretary Brian Stratton said the job cuts were "an excessive over-reaction".
"EasyJet won't find a supply of pilots waiting to come back when the recovery takes place over the next two years."
Easyjet currently has 11 bases in the UK, with 163 aircraft, serving 546 routes.
An Easyjet "base" means having aircraft and crew based at the airport, while "serving" an airport means aircraft and crew flying in from other bases.
Easyjet has seven aircraft based at Stansted, with 335 crew. At Southend, there are 183 crew and four aircraft. And there are three aircraft based in Newcastle, with 157 crew.
The job cut proposals are not limited to the bases that may close, a Unite spokesman said.
Lower demand
Even though it is looking at closing Stansted, Southend and Newcastle, it said the airports would remain part of its route network.
The airline said in May that it planned up to 4,500 job cuts as it struggled with the collapse in air travel due to the coronavirus crisis.
Even though Easyjet has started to fly passengers again, it does not expect 2019 levels of demand to be reached again until 2023.
Airlines have been hit hard by lockdowns and travel restrictions around the world, with many announcing job cuts.
Reuters reported on Tuesday that Air France/KLM would present a plan to unions to cut more than 6,500 jobs over the next two years as the airline deals with the effects of the coronavirus crisis.
Source: BBC
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