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Re:Save money flying from New York and San Francisco by Dawenster on Tuesday August 19, 2014 @03:59PM (#8199445)
They certainly frown, but only if they know you're doing it. Don't lie if they ask, but no need to offer it up. You can also book without using your frequent flyer info to be safe.
Re:Save money flying from New York and San Francisco by toomuchtodo on Tuesday August 19, 2014 @04:03PM (#8199465)
If you do book with your frequent flyer number, their revenue department will revoke any rewards/mileage you have if a trend develops.