On-site testing is going to be the only way in the short term that travel will be allowed to start up again.

Combined with social distancing measures on board the aircraft. Although I think some of these are impractical long-haul - such as only selling A+C seats - going to have to pass each other to use the toilet at some point on a 7/8/9+hr flight.

For me, as a primarily leisure traveller, it needs to be measures for eliminating any form of prolonged quarantine on arrival. My next booked trip is 4 nights in NYC in March 2021, no point in going if I have to spend all of it quarantined