Up to 20% offer is valid for bookings made through January 31, 2013 for travel January 28 - February 28, 2013. Must use eCertificate CDG20PCT to receive discount. Discount is taken from the base fare and does not include surcharges and taxes. eCertificate is not valid for Envoy tickets. All segments must be operated by US Airways, and is not valid for itineraries involving other carriers. Roundtrip purchase required. Fares require a 7-day advance purchase, a three-night minimum stay and a 30-day maximum stay and tickets must be purchased within 24 hours of making the reservation. Tickets are non-refundable; any changes to transatlantic flights originating in the U.S. will incur a minimum $250 fee. Advertised fares are available on usairways.com. Additional surcharges/taxes/fees apply. Additional terms and conditions may apply. Checked bag fees may apply. Tickets purchased through Reservations incur a fee of $25 for domestic travel or $35 for international travel. Tickets purchased at US Airways ticket offices incur fees of $35 for domestic travel or $45 for international travel. Fares purchased through travel agents may incur additional fees. Seats are limited and may not be available on all flights. Fares are subject to availability and may change at any time.