Back to basics : What is flying currently : Cargo, military , some Sate flights and some business aviation . Add a few Domestic pax flights and some migrant workers charters . = between 5 to 10% of what was flying 4 months ago.
Nobody can maintain 100% of his infrastructure with those numbers for very long . We need the massive pax airliners back.
Domestic travel in large countries might come back early but international travel ?
For this you need reopening of the borders and lifting of travel bans/ quarantine etc.. and assurances that the virus is contained and you are not taking a high risk transiting through airports ,with questions like passing security , immigration queues, boarding gates, inside the aircraft , sharing toilets ,disembarkation buses, luggage collection , customs queues etc...
Insurance and medical assistance at the other end of the trip will also play a role in getting pax back in airplanes in large numbers at least in the beginning ...
How all this will be tackled and worked on will depend on how we will be in 6 months time . And it's all out of our hands
