Major U.S. airlines face potential pilot strikes as unions demand higher pay

Southwest Airlines pilots voted to authorize a strike, though one is unlikely to actually happen soon.
American Airlines pilots also approved a strike mandate as they seek a contract matching Delta's pilot deal.
The votes are a negotiating tactic to put pressure on airlines as pilot contracts have been under negotiation for years.
United Airlines pilots plan to picket for higher pay after working four years without a raise.
Though strikes can't happen immediately due to laws, unions believe the votes strengthen their position.