A budget airline that serves mostly small U.S. cities began federal deportation flights Monday out of Arizona, a move that's inspired an online boycott petition and sharp criticism from the union representing the carrier’s flight attendants. Avelo Airlines announced in April it had signed an agreement with the Department of Homeland Security to make charter deportation flights from Mesa Gateway Airport outside Phoenix. The Houston-based airline is among a host of companies seeking to cash in on President Donald Trump's campaign for mass deportations.