Airfares are subject to change until you actually purchase your ticket. Airlines reserve the right to pull rates at anytime and seats can sell out between the time you checked rates and the time you actually purchased. The best thing to do is to purchase your ticket when you find an acceptable airfare. Yes, you can hold a reservation for 24 hours. Please note that by holding a reservation this doesn't guarantee the rate.
Airfares are subject to change until tickets are purchased.
You may either provide the airline your account number on the day of departure or contact the airline directly. Between the time that you click purchase and the time that the reservation was manually processed by an agent the airline reserves the right to remove rates. This happens in very limited situations, but it can happen. If you have received an email, your reservation has been cancelled and your credit card was not charged. Please re-book your reservation online.