This is the biggest reason I keep cash around. Also, I travel on business frequently, I have my wallet and a passport wallet, and I keep some cash in each - in

This is the biggest reason I keep cash around. Also, I travel on business frequently, I have my wallet and a passport wallet, and I keep some cash in each - in the passport wallet enough to get a cab out of the airport to a hotel, where presumably I can garner a room using my rewards points or have my company wire me money.