“If they’re packed as tightly as an SWA 737 with recirculating air for 4 hours, then YES.”
The air inside an airliner recirculates every 2-3 minutes. It flows from the ceiling to the floor. 50% is vented. The remaining 50% then goes thru hospital grade filters. To it is added an equal volume of air from outside the aircraft, which apart from being at 30,000 feet is also heated hot enough to kill viruses and then cooled and mixed.
The air inside an airliner is darn pure once you get airborne. And the planes are sanitized daily. It is one of the cleanest places you can go. Much cleaner than WalMart, restaurants or most any other building.
“The remaining 50% then goes thru hospital grade filters.”
As long as they’re maintained, or even installed. Perhaps you can point us to the FAR requiring filtering for recirculating air?