LONDON: Britain introduced a two-week quarantine on Monday for most people arriving from abroad to try to limit the spread of the coronavirus, sparking condemnation from the ailing aviation sector, which claims it could cost tens of thousands of jobs.

British residents and overseas visitors will have to comply with the 14-day self-isolation rules or face a £1,000 ($1,250, 1,125-euro) fine or prosecution.

Critics question why Britain, which has been hardest hit by Covid-19 in Europe and is only gradually easing a lockdown, is inflicting more pain on hotels and airlines by reducing travel from countries with fewer virus cases. British Airways and budget carriers EasyJet and Ryanair have launched joint legal proceedings against the government over what they called a "disproportionate and unfair" step.

Ryanair boss Michael O'Leary told Sky News television on Monday the plan was "useless" and unenforceable, and said it would "devastate thousands of jobs in British tourism".

The chief executive of London's Heathrow, John Holland-Kaye, told the City AM newspaper it could lead to the loss of potentially 25,000 jobs at his airport - a third of staff. But Health Secretary Matt Hancock said the new rules made sense because "the proportion of infections that come from abroad increases" as Britain's own caseload drops.