All one-way and return tickets are valid only for the date and schedule selected at the time of purchase and printed on the ticket, and will be honored for transportation daily. Departure date and time for any previously purchased ticket may be changed for a charge (see Refunds and Exchanges section for details)
Departure date and time for any one-way or return ticket may be changed for a charge of $15 per ticket provided the following conditions are met:

Any advance purchase requirement must not be violated
Holiday blackout restrictions for Advance Purchase fares must not be violated in any exchange.
Origin or destination may NOT be changed in an exchange.
One year time limit of original ticket must not be violated. All transactions and travel must be completed within one year of the original purchase date, unless otherwise specified.
Ticket must not be a Discovery Pass, Commuter Ticket or other program for which ticket changes are not allowed.
Note: No fee will apply if the date or schedule has been missed as a result of delays caused by breakdowns, road conditions or other conditions beyond carrier抯 control.