Jet2 has confirmed redundancies are planned as part of a review of operations across Spain.
Unconfirmed local reports suggested that around 35% of 996 staff based at airports in Alicante, Palma, Tenerife, Gran Canaria, Lanzarote and Fuerteventura could be affected.
Changes to Jet2holidays’ in-resort flight check-in have been cited while flight and cabin crew are also affected.
A 30-day period of consultation with unions involved over potential redundancies has been instigated.
A company spokesperson said: “We have recently reviewed our operations in Spain.
“As a result, we must sadly propose a number of colleague redundancies across resort flight check-in, flight deck and cabin crew roles.
“We deeply regret these proposed redundancies, and we will be consulting with appropriate representatives of the affected colleagues to ensure that all options are fully considered.”