I played the Fire Support character (skyhammer) on the Uk1 server at 8 pm (server time) today. After throwing the air strike canister (London Bridge map) I noticed that there was no air strike although the canister seemed to be under un-hindered sky. And the canister never went away.
The canister just remained there for at least five minutes. It doesn’t show in this screen shot, but it was blinking red all the time.