There are special airfare deals that make it easier and sometimes cheaper to travel to individual countries and multi-country regions. Most of the passes are packets of coupons, and there are usually minimum (about three) and maximum limits on the number of coupons you can buy. The airlines sometimes are reluctant to work with travelers on putting together these special deals. Often the reservation clerks don't even know about them.

Domestic programs are sometimes limited to certain groups such as students or seniors. Sometimes they are sold as part of promotions between the airlines and travel clubs. For international passes, these programs are usually open to persons residing outside the country or countries within which the flights are being taken.

United States airlines offer similar programs for domestic United States flights to persons living abroad even if those persons are United States citizens. Some United States residents, as a result, have enrolled in these programs while out of the country, used a foreign address and then used the passes, tickets, or coupons in the United States.
To determine your best cost options, always compare the price of an air pass, visitor ticket, or visitor discount fare with whatever alternatives are available. Fare prices to inquire about might include: a single long-haul ticket that includes all the stops you want to make, side trips by surface transportation (rental car or train), or airline side trips purchased individually.

International Air Pass programs: Discover Europe: Valid on British Midland for travel throughout the United Kingdom.
Europe Flight Pass: Has 60 cities in its network at $90 per flight.

You have 13 airlines to choose from (regardless of your transatlantic carrier)
Transatlantic travel on Aer Lingus and covers travel to Amsterdam, Brussels, Copenhagen, Dusseldorf, Frankfurt, Milan, Paris, Rome and Zurich for $99 per segment, and you have six months to use the pass.
Polypass: Valid on Polynesian Airlines for travel to American Samoa, Australia, Fiji, New Zealand,Tonga and Western Samoa. Maximum travel time is 45 days.
Visit Baltic: Covers Estonia, Latvia, Lithuania and Russia, and requires transatlantic travel on Scandinavian Airlines.
Visit Scandinavia Air Pass: Coupons that can be used any time of the year on all SAS routes linking Scandinavian cities, including domestic services. $80-420.