The incident also highlighted the fact that passengers can legally pack guns in checked baggage — and access them after claiming their bags.
The FBI said Esteban Santiago flew on a one-way ticket from Alaska to Fort Lauderdale with a gun and ammunition in a case in checked luggage, according to the Associated Press. Authorities say he picked up the case, loaded the gun in a bathroom and came out firing at travelers.
Some called for increased security to prevent such incidents at airports.
Delta's policy on "shooting equipment" also says: "Until further advised, passengers departing Brussels, Belgium are not allowed to check weapons including, antique, sporting, hunting or toy rifles in their checked baggage."
Delta recently restarted its flights from Atlanta to Brussels, one year after the terrorist attacks in Brussels that included bombing at the airport. It had stopped flying the Atlanta-Brussels route after the attacks in March 2016, and resumed its New York-Brussels flights in April 2016.