Correct but need to adjust for historic timelines and countries of origin -
"The earliest U.S. air marshals were normally armed with .38 Special revolvers. Israeli air marshals, among the first deployed, carried Beretta .22 autoloaders, relying on precise shot placement and multiple hits to eliminate a threat. It should be noted, too, that the Israelis carried their Berettas with the chamber empty and were trained to rack the slide as they brought the pistol into action. Swiss air marshals have been drawn from their canton's SEKs (SWAT teams) and assigned for temporary duty aboard Swiss Air flights. Carrying SIG P-225s with light loads and expanding bullets, they usually reflected their country's emphasis on individual marksmanship.
Russian air marshals usually carried Makarovs with special frangible loads. At least some of the Jordanian air marshals have been equipped with suppressed .22 pistols. Obviously, different units have developed different solutions.
US air marshals started with P225, then P228 both in 9mm and now are issued P229 in .357 SIG"
-quoted from GunsandAmmomag.com