British Airways and Ryanair are just two airlines considering legal action against state-imposed quarantine plans but IAG chief executive Willie Walsh suspect other carriers will follow suit.
From Monday, passengers entering the UK will have to undergo a 14-day quarantine period, similar to rules already introduced in a number of countries.
Airline groups around the world, including Mr Walsh’s IAG, argue that enforced quarantine will discourage people from travelling and hamper the aviation industry’s recovery.
Speaking to the UK’s Sky News ahead of the new rules coming into force, Mr Walsh said that quarantine measures will ‘torpedo’ BA’s chances of flying in July.
"We think it is irrational, we think it is disproportionate and we are giving consideration to a legal challenge to this legislation,” said Mr Walsh.
He added that he expected other airlines to follow suit.
Industry representative body the International Air Transport Association (IATA), has opposed quarantine measures proposed by states.
It said recently that quarantine measures “are obviated by the combination of temperature checks and contract tracing”.