CheapAir is also presently the only real online travel agency in the US that allows you to buy flights with Bitcoin. CEO Jeff Klee started the platform in 1989 from his college dorm room after getting a crash course in the airline industry while making plans a backpacking trip through Europe on a student’s budget. “Our cryptocurrency clients tend to be very vocal about what they want, something we respect greatly,” he said. “Over the last six months, we’ve seen a huge uptick in the number of customers soliciting for choice currencies, so we’ve worked hard to combine the 3 that were most asked.