https://community.expensify.com/discussion/13954/888-829-1467-can-i...
You can change your departure or arrival airport, your departure or arrival date, or both. Review and confirm your changes. Check your email for a confirmation of your new flight. How much does it cost to change dates on American Airlines? No change fee on American-operated flights, but the difference in fare still applies. How can you change the date on an already booked flight?Check the airline's or travel agency's website for their flight change policies. This will give you an indication of what fees, if any, you would have to pay and what options you have. To request a flight change, call or email the airline or travel agency. Make a note of your reservation number and travel dates