No one is going to fly except if they need to
 

Of course it depends where you are located ,but in the 4 European countries I have family in and currently spend my time , this is very much the spirit. Most people I interact with say they will go on holidays inside their country this year. The older generation is not going to go abroad and risk quarantine in a foreign country they do not speak the language and with inferior medical services already overloaded.
As to business travel, both the organisation I work for and the ones I interact with have canceled all physical meetings until end on the year.
I do not mention this out of fear, but sometimes you have to face the facts .

You have to understand one thing. So called "required" travel will not be viable without recreational travel which means the airlines will not fly. Airplanes have to be filled in order to earn money.