In a letter to Sunak, Airlines UK chief Tim Alderslade said the sector needed 100% furlough support for aviation workers until at least April 2022 "to protect skilled aviation jobs over the unprofitable winter season".
He also asked for urgent clarity existing support will not taper off from the end of June.
"If a meaningful reopening is not possible during the summer given current government policy and application of the Global Travel Taskforce recommendations, then targeted economic support will be essential to ensure UK airlines are able to reach the point when a restart is possible, in order to protect many tens of thousands of jobs," said Alderslade.