frequent flyer
n.— «The claimants enter Canada as refugees and leave Canada afterwards to return again as refugees using phoney names, immigration officials said. The multiple claimants have been dubbed “frequent flyers” by officials.» —“Police can’t stop ‘frequent flyers’ selling refugee papers for big bucks” Hamilton Spectator (Ontario, Canada) Mar. 6, 1995. (source: Double-Tongued Dictionary)