American Express: 800-346-3607 or www.americanexpress.com/travel
Britrail or British Heritage Pass: 877-677-1066 or visit www.britrail.net
Conde Nast Traveler: www.concierge.com/cntraveler/
Discount European Airlines: www.ryanair.com, www.easyjet.com, www.airberlin.com, www.spanair.com.
EuropeByAir (www.europebyair.com) sells $99 one-way passes within Europe to 150 European cities, but you must buy tickets before leaving home.
Eurail: 800-4EURAIL or www.eurail.com
Holland America: 877-SAIL-HAL or www.hollandamerica.com
Paris Museum Pass: www.museumpass.com
Travelocity: www.travelocity.com
Travelsmart Newsletter: 800-FARE-OFF or www.TravelSmartNewsletter.com