If you want to book an earlier flight with American Airlines go through the information given below:
· You have to pay additional 75 dollars for booking standby flights or applying same-day change to the flights within US Virgin Islands, Puerto Rico.
· For Canada and Caribbean also you have to pay same fee that is 75 dollars but standby flight is not available.
· For booking a same-day or standby flight between London-Heathrow and New York JFK fee you have to pay is 150 dollars.
· You can book an earlier flight only if your flight is confirmed 24 hours before the departure time of new flight.
· You can book an earlier flight only in the same route of your actual booked flight as connecting city is not allowed to be changed.
· To AAdvantage executive platinum members or passenger flying on an award ticket the standby or same-day change is allowed for free.
American Airlines earlier flight booking may be opted by a passenger due to any reason like they are free from the work and have enough time to catch an earlier flight, they may have booked a later flight that is less expensive in the hope of catching the more expensive earlier flight etc.
Earlier flight due to any reason like you are free from your work and you have enough time for catching an earlier flight, many times you book a later flight that is less expensive in the hope of catching the more expensive earlier flight.