Speaking specifically about Russia, you can buy air tickets and food for bitcoins in Russia.
Was not aware of this at all. Doesn't it cause problems in case of emergency booking ? Since bitcoins take 10-15 minutes to process these days, a lot of tickets will be booked by the time your payment goes through. Is it thus a good option to pay when there are only few tickets left. And what about the food, you eat food,make payment and then wait for 15 minutes for the payment to process ?