(FILES) This file photo taken on September 25, 2006 shows Alaska Airlines planes at Seattle-Tacoma International Airport.  Alaska Airlines parent company Alaska Air Group said on April 4, 2016 it was acquiring Virgin America in a friendly takeover worth around $4 billion including debt to create the US's fifth-largest airline.A definitive merger agreement had been unanimously approved by the boards of both companies, it said in a statement.  / AFP PHOTO / GABRIEL BOUYSGABRIEL BOUYS/AFP/Getty Images Photo: GABRIEL BOUYS, AFP/Getty Images
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