Tried several times to book online for my wife and I using my credit card. The airline website requires a security check, which I allowed. But the system concluded that card is stolen and refused my payment. I called Visa, they haven't received any request from the airline. I called the airline agents several times and beg them to contact their IT about the problem. They are not understanding and cooperative at all. Very frustating experience!
Check the real ticket price: During flight search, some airlines show the ticket's price without the taxes (like fuel fee, airport taxes, government taxes). Before choosing a flight, check the full price (inclusive of all taxes) that has to be displayed in one of the next steps (before entering your card details).