Jet2 has cancelled all flights and holidays until at least June 17 due to the coronavirus pandemic.
Anyone due to travel before this date is now being contacted to make alternative plans.
It told customers who have booked through On the Beach, loveholidays or another online agent to get in touch with the OTA directly.
"We will be contacting all affected customers to discuss their options, one of which is rebooking to a later date," it said.
"We are contacting customers and dealing with all existing queries in departure date order, which we believe is the fairest way to handle this.
"The number of calls we have been receiving is unprecedented, so you do not need to make contact with us."
It added: "Although these are difficult times for everyone, the sun will come out again."
The announcement came after the FCO imposed a global ban on non-essential travel for an ‘indefinite period’.
A ban had originally been put in place until April 16.
Since Jet2’s announcement, TUI has confirmed the suspension of holidays until May 14.
It is believed it is staggering the dates in order to lessen the workload for its remaining staff. It has furloughed the vast majority of its agents plus many staff in head office roles.
