A recent study (
https://www.medrxiv.org/content/10.1....02.20143826v3) found that the risk of infection on a flight is 1 in 4,300 for a full flight (becoming 1 in 7,700 if the middle seats are kept empty).
Also, Australia has been using contact tracing on flights (
https://www.health.nsw.gov.au/Infect...x#nsw-domestic) and has found that while infected people
have travelled on aeroplanes, nobody has been infected on aeroplanes.