Yellow cab scam at COS. While the older scraggly haired hippie driver showed up on time and drove me to the airport, he then showed up after I'd checked my bag - halfway between there and security. I'd carefully paid him for the $38 fare with two fanned twenties, which he'd accepted, and then gave him a $5 tip. He showed me one twenty and the five. Avoid this company, try another cab company and get a receipt, or use uber if you have a smart phone; it's cheaper.