You can change your booking on British airways reservations up to 48 hours after the original scheduled time of departure. to make changes after then, you must phone us, or visit a travel shop. all changes must be made within 14 days of the original scheduled departure time. Dial +1-802-231-1806 For booking http://socio.cebaca.org/read-blog/4171_how-to-you-change-your-airlines-booking-with-british-airways-reservations.html