Airlines including Ryanir, easyJet and TUI have expressed their concerns about the new travel restrictions imposed by Boris Johnson.
Claiming the new Omicron rules are 'haphazard and disproportionate', the travel companies believe the restrictions have disrupted Christmas plans.
The tougher rules introduced mean that people entering the country, from a non-red list country, must have evidence of a negative pre-departure test.
READ MORE: What Boris Johnson said in his announcement to the nation
Travellers must also self-isolate until they receive a negative result from a post-arrival test.
People arriving in the UK from the 11 African countries currently on the red list must take a test and spend 11 nights in a quarantine hotel at a cost of £2,285 for solo travellers.
In a letter to Boris Johnson, obtained by the Telegraph, the chief executives of eight companies - including Ryanair and British Airways - accused the prime minister of breaking his promises to fix the expensive cost of PCR tests for travellers.
They said: "As leaders of UK airlines, we are deeply concerned about the haphazard and disproportionate approach by government to travel restrictions following the emergence of the omicron variant."
Given the timing of the restrictions, so close to Christmas, they believe 'customer sentiment' has been 'undermined.'
They added: "We and our customers feel sincerely let down, having believed a more pragmatic, evidence-led approach to travel, in line with the rest of the world, had been achieved and agreed by all concerned just a few months ago.
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"Instead, the layering of additional travel restrictions, introduced at short notice without consultation or discernible strategy, have disrupted Christmas plans and [undermined] customer sentiment just before the crucial Christmas and New Year booking season - up to 30% of tickets are sold."
The letter demanded that "all emergency testing for fully vaccinated passengers should be removed at the formal review on 20 December" and a "package of bespoke economic support measures should be provided immediately to bridge the sector through this crisis".
The letter, which also came from the bosses of Tui UK, easyJet, Loganair, Virgin Atlantic, Jet2 and trade group Airlines UK, added: "We urgently request you meet with us, to understand the problems that we and our customers are now facing because of these measures, which the Transport Secretary himself admitted risked 'killing off' the travel industry.
"We urge you to act now to prevent this from happening."
It comes as ministers are set to consider whether to replace hotel quarantine with self-isolation at home for fully vaccinated travellers, the Telegraph reported.
