International travel from the UK is yet to restart in a “meaningful” way despite the easing of some restrictions, the industry says.
Trade group Airlines UK said bookings had failed to recover due to the “frustrating” traffic light system and costly testing requirements.
It added that consumer confidence would remain weak without change.
The comments came as Heathrow warned it expects to see a further fall in passenger numbers in 2021.
The airport, which was Europe’s busiest before the pandemic, welcomed just four million passengers in the first six months of the year – a total that it would have taken just 18 days to reach in 2019.
In a letter to the transport secretary Grant Shapps, Airlines UK noted that passenger bookings in the rest of Europe had recovered to 50% of pre-crisis levels in June, compared to just 16% in the UK.