Overseas travel from England that’s not related to work will be prohibited to help curb a resurgence of the coronavirus, throwing airlines into a fresh crisis.

The new rules, part of a wider partial lockdown by Prime Minister Boris Johnson, will apply from Thursday until Dec. 2 and come as the industry struggles to survive a collapse in demand. Airlines hadn’t been informed about the restrictions before Johnson’s announcement Saturday evening, according to people with knowledge of the matter who asked not to be identified as they weren’t authorized to speak publicly on the issue.

Carriers were already reeling from the COVID-19 pandemic. They have eliminated jobs, retired older fuel-guzzling aircraft and turned to capital markets and asset sales to survive a slump in travel. Many have slashed capacity further in the wake of the resurgence in COVID-19 infections during the slower winter season.