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Who performs the blocking on a Visa card?
It is the people who you bought the ticket from. Blocking is frequently done by hotels, gas stations, or rental car companies. Also, for anything where the credit card might be used to cover any damages or charges you might incur later as part of the transaction. In essence, they are reserving part of your credit limit, ostensibly to cover charges they reasonably expect you might incur. For example, when you start pumping gas using a credit card they may block out $100 to make sure you don't pump a full tank and your credit card is declined because you ran over your limit at $3.  In general, the blocks clear fairly quickly after you settle up with the company on your final bill. You can also ask the company to clear the block, but I don't think they are required to by law in any specific time period. It may be up to their (and your) agreement with the credit card company. Normally it isn't an issue and you don't even notice this going on behind the scenes, but if you keep your credit card near its limit, or use a debit card it can lead to nasty surprises (e.g. they can make you overdraw your account). One more reason not to use debit cards. More information is available here on the Federal Trade Commission's website.