possibly the main reason for these flight interruptions as Airports, FAA, people that run Air travel have decided they must have test to determine which pilots have had any vax's and which ones have AND they are making new pilot schedules to pretty much let only pilots unvaccinated fly at this time , because if just one pilot or 2 or 3 had medical symptoms that affected their landing capabilities especially during the actual landing protocols of a flight, hundreds of people could die on each of these planes. Amplified by a thousand or more a year if not checked right now.