In reply to Phil4000:
There may need to be a price correction to the cost of flying which will impact who flies.
I think quarantine and tracking of individual who move between continents will increase - much like the massive overreaction to 9-11 changed airport security. Some could me minor - with rapid screening you could check people before they board cruise ships or long-haul flights.
I think the "we need to travel" mentality in business will change, and I speak as someone with teams on 3 continents. Companies will save money.
So flights will become more expensive. I wonder if you took the cost of a flight in the 70s or 80s and adjusted for inflation what the comparison would be. I found a graph for US which showed it was now half the 1980s price (inflation adjusted).
So drop the low margins (who go bust quickly) and you're looking at ~£500-1000/person return flights to Europe. Family holiday £3-4k with accommodation. Compared with stay in the UK £1k / week.