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Meet the 'homeless man' who flies the world first class
For the last year and a half, Ben Schlappig has been essentially homeless. The 25-year-old American has neither fixed address, nor the keys to his own front door. Why bother paying rent, he figured, when a bed was only ever a first class ticket away?
Schlappig is a "Hobbyist," as those in the game call it - a professional traveler with an almost obsessive attention to fine print, who uses a mixture of frequent flyer miles and credit card reward points, to zoom around the globe for a fraction of the cost.
Since he first started racking up air miles a little over a decade ago – yes, he was just 14 when he started this – Schlappig says he's never flown economy on an international flight.
Taken from http://edition.cnn.com/2015/12/01/travel/ben-schlappig-flyworld- free-airline-air-miles/index.html
Choose the correct verb that can replace the phrasal verb “racking up”, according to the text.
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