This could have been a genuine Islamic State threat, or just someone who thought it would be cool to imitate what appears to be the strong horse. In any case, the objective is to “strike terror into the hearts of the enemies of Allah” (Qur’an 8:60).
“‘We’ve planted explosives on Delta fight [sic] 1061 . . . ‘ Chilling ISIS tweet grounds flight en route to Orlando,” by Michael Dorstewitz, BizPac Review, January 26, 2015 (thanks to Pamela Geller):
A “security concern” forced a Delta flight to Orlando to make an unscheduled landing at Dallas-Fort Worth International Airport. The diverted flight was prompted by a tweet originating from the twitter account @AllahuAhkbar911 to @DeltaAssist. The message read:WE HAVE PLANTED EXPLOSIVES ON DELTA FLIGHT #1061 FROM LA TO ORLANDO, WE ARE ISIS, WE ARE HERE, YOU WONT BE.
Twitter reports that the account has been suspended.