Theres no way to extend the expiration date on funds. Any time you apply them, in fact, all funds from that new reservation (including new money) take on the earliest expiring expiration date of any funds used.
Once expired, you may be able to recover some of the funds by contacting Customer Relations and requesting reissue as a voucher. The fee is $100, deducted from the funds balance. These requests are granted on a case-by-case basis.
