Don’t throw out – or delete – your airline boarding pass once you tough down.

Here’s a story I recently put together for CNBC about all the hidden perks airline – and railroad – boarding passes can provide.

Bonuses for air travelers include everything from free ski lift tickets, to complimentary wine tastings and discounts on meals, ground transportation and adventures.

Some of the deals below are offered for limited times or only during certain seasons. Others can be used multiple times. Read the program details and, of course, don’t be too quick to delete your boarding pass image from your phone or crumple up that paper pass after your trip.

Ski free

Skiers can score a free lift ticket and, in some cases, free or discounted gear rental by showing an Alaska Airlines boarding pass at a dozen ski resorts in Alaska, California, Canada, Colorado, Idaho, Montana, Oregon and Utah. Most of the deals invite travelers to hit the slopes on the days they arrive or depart and can represent a savings of up to $200.

At some resorts, such as Squaw Valley and Alpine Meadows in North Lake Tahoe, California, guests who show a same-day boarding pass from any commercial airline receive a complimentary lift ticket for the day they arrive.

Sip and ship wine for free

In Oregon, Washington, Idaho and parts of California, an Alaska Airlines boarding pass is a win-win for fans of wine.

Through the airline’s “Wine Flies Free” program, members of the airline’s Mileage Plan frequent flyer plan may check a case (12 bottles) of wine for free when flying domestically on Alaska Airlines, Horizon Air and SkyWest flights from 29 west coast cities, including San Francisco, Portland, Seattle and Boise, ID.

In the wine regions of both Oregon and Washington, hundreds of participating wineries also offer complimentary tastings to anyone showing an in-bound Alaska Airlines boarding pass and proof of Mileage Plan membership.

And as part of Washington’s Taste and Tote program with Alaska, the drop-off fee will be waived for one-way Hertz rental cars picked up in Yakima, Pasco/Tri-Cities or Walla Walla and returned at one of the other two cities in the program.

Boarding pass deals from international carriers

Turkish Airlines passengers with layovers of between six and 24 hours in Istanbul can show their boarding passes at the Hotel Desk and join a free highlight tour of the city.

Korean Air’s Excellent Boarding Pass program offers a full week of perks in Korea to passengers who hold onto their international boarding pass from an overseas region. Passengers traveling from Korea to an international destination can take advantage of boarding pass offers for a full month.

In Korea, the perks include discounts on everything from meals, attractions and cultural performances to cell phone rentals, rail tickets and medical services. Worldwide, the perks range from discounts at outlet malls in the United States and 30 percent off single visits to the aquarium, zoo and other attractions in Sydney, Australia. 

Singapore Airlines’ Boarding Pass Privileges program offers Singapore Airlines and SilkAir passengers a full month of discounts on hotel stays, car rentals, meals, purchases and attractions, including the Gardens by Bay, the Singapore Flyer, and the Singapore Zoo. Deals are updated every six months and include discounts on shopping, dining and spa services inside Changi Airport as well.

The Magic Boarding Pass program from Asiana Airlines offers passengers discounts on tours, transportation, hotels, restaurants, shopping, theater and attractions around the world for up to a month after a flight. In Korea, the perks include discounts at Seoul’s Lotte World Aquarium and JeJu’s Teddy Bear Museum. In the U.S., Asiana Airlines passengers get a discount when riding the Hawaii’s Waikiki Trolley. And in Rome, pass holders gets a free gift with purchase at the Hard Rock Café.

Train travelers get boarding pass perks too

The boarding pass perks aren’t limited to air travelers. Amtrak and Eurostar riders get bonuses too.

In California, Amtrak has a discount offer on Disneyland Resort theme park tickets for passengers with reservations on the Pacific Surfliner. Many transit providers along the route also provide free bus or shuttle rides to passengers who show their Pacific Surfliner ticket. Train passengers may also purchase discounted day passes for the Los Angeles Metro and San Diego MTS buses and trolleys in the Surfliner’s Café Car.

A “Car Free” promotion in Santa Barbara  offers discounts on tours, attractions and meals to Amtrak ticket holders as well.

And Eurostar boarding passes entitle passengers to 2-for-1 tickets on entry and special paid exhibitions at museums in destination cities including London, Brussels, Paris and Lille, France.

Have you found a hidden perk in your boarding pass? Let us know!