Baggage handlers and check-in staff at a company serving four airports including Stansted have voted to strike in a row over pay.
Unite said its members at Swissport backed industrial action by 94 percent in a turnout of just over 50 percent.
The union said it has 1,000 members at the firm, based at Gatwick, Heathrow, Manchester and Stansted airports.
Talks will be held on Wednesday (16 October) to try to resolve the dispute.
Unite national officer Oliver Richardson said: "The dispute centres on the company's decision to freeze workers' pay for 18 months, from April 2012 through to October 2013, followed by a below inflation increase of just 2.5 percent."