Is COVID spreading on airplanes? Little data is being collected.

Is COVID spreading on airplanes? Hello, science? Anyone? Two and a half years later we still don't have good data to answer the question of whether transmission is actually happening on planes or not. Why? Sam Kemmis MarketWatch

...of all the billions spent combating the virus, supplying at-home testing kits and bailing out the airlines, little to none of it was spent answering the basic question of where and how people actually contracted the disease in the first place. 

...