Interline Baggage Agreements: A Guide for Hassle-Free Travel

by joeheg

Interline baggage agreements are agreements between airlines that allow them to handle passengers’ baggage through multiple flights, even if those flights are on different airlines. This means if a passenger has connecting flights on different airlines, they can check their bags at their origin airport and have them transferred to their final destination without having to claim and recheck them between flights. Interline baggage agreements can make travel more convenient for passengers, saving them time and hassle at airports

When you accumulate enough points and miles to book an award trip, you’ll discover that it’s quite challenging to find a ticket from your hometown to your desired destination on your preferred dates with the points you have. However, if you do find such a trip, it’s best to book it immediately. After that, you can rush to the store and buy a Powerball ticket, because it’s quite evident that it’s your lucky day!

When traveling, you may need to fly from your home airport to the departure city or from a nearby airport to your final destination. In award travel lingo, that’s called a positioning flight.

Choosing which airline to take for your positioning flight may make the difference between an almost seamless connection or a sense of déjà vu where you’ll need to do the entire airport check-in process all over again. That means you’d need to land, go to baggage claim to collect luggage, head back up to the departures lane, re-check your bags and go back through security. If your international flight is leaving from a large airport like JFK, LAX or O’Hare, you’ll also need to take a train between terminals with all of your luggage.

That is unless the two airlines you’re flying have an interline agreement. Here’s a simplified list of the interline baggage rules for the major U.S. carriers:

NOTE: You’ll see the term PNR thrown around in these descriptions, which stands for Passenger Name Record. That’s the six-character number assigned to your airline reservation. You can save several flights under the same PNR, even from different airlines. The issue we are discussing involves having two flights on different airlines with different PNRs
The bold type is for emphasis on rules for two separate tickets.


Delta will check a customer’s baggage between the origin and destination airports that are issued on a single or conjuncted* ticket exclusively. When issued on one ticket, Delta will also continue to check baggage through to the ticketed destination for interline itineraries.  If a second ticket is presented for travel, Delta will only check the bag to the destination of the Delta ticket(s). Baggage may be claimed at the Delta-ticketed destination, and then re-checked by the customer with the downline carrier for the next flight.

* A single ticket also means a conjuncted (i.e., conjunctive) ticket. Conjuncted tickets are sequential in number on same ticket stock.  It is not possible to conjunct tickets from different airlines.


In cases as noted below, when more than one ticket is presented, Delta will continue to through-check baggage from the origin to the destination.

  • An entire journey (itinerary) consisting of Delta-marketed / Delta-operated flights
  • SkyMiles Award plus a ticket with Delta-marketed / Delta-operated flights
  • Delta ticket plus a ticket that includes one of the following Delta partner airlines, as long as the flight is “operated” by that airline:   
    • Aeromexico (AM)
    • Air France (AF)
    • China Eastern (MU) 
    • ITA Airways (AZ)
    • KLM (KL)
    • Korean Air (KE)
    • LATAM (LA)
    • Virgin Atlantic (VS)
    • WestJet (WS)
  • Delta ticket plus a:
    • Connection to a Delta charter flight
    • Active duty military traveling on orders


If you have a separate ticket on another carrier, you must claim bags at the destination of the first ticketed itinerary and check bags with the other carrier to the final destination. Baggage can be checked through to the final destination if the separate ticketed itinerary includes Star Alliance member airline-operated flights.

Reports are that United will not interline bags for passengers flying on Basic Economy tickets.


Travel that includes multiple airlines or tickets

If your travel includes multiple tickets, and/or travel on more than one airline, your baggage fees and rules may be determined by the other airline. Please check your ticket, or call Alaska Airlines Reservations at 1-800-252-7522 to help determine which airline rules and fees apply to your journey.

When making international connections on a separate ticket to other airlines within twelve (12) hours of arriving in the connection city, you may follow the baggage allowance and weight restrictions of the international airline – provided a ticketing and baggage agreement is in place between Alaska Airlines and the other carrier.

When there are separate tickets issued in separate PNR’s, customer’s baggage will be checked to the final destination of the American 001 ticket. The customer is responsible for the baggage fees associated on the second ticket when the baggage is re-checked with the oneworld airline. This may involve exiting the secure area to claim and re-check the baggage. International flights may require clearing customs and re-checking on the other airline to the final destination.

Southwest (From a Southwest message forum)

Hi @Ruth0821,

You’ll have to retrieve your bag from baggage claim after the end of your Southwest flight and check it on Hawaiian for the next portion of your trip. 

Community Manager
The Southwest Airlines Community


We understand that sometimes you have to book different portions of your journey on different airlines using separate tickets. When this happens, we cannot ensure there’ll be a long enough connection time to transfer your bags to your next flight. That leads to misconnected bags, which is not a good thing for anyone. 

If you’re booked on separate tickets with another airline connecting to Hawaiian Airlines, please collect your bags from the baggage claim at your connection airport and re-check them with a Hawaiian Airlines agent. At that time, baggage fees may apply.


I was expecting to see something like a big “NOPE!” but instead, there’s no mention at all of the interlining of baggage.

Final Thoughts

The only three airlines that allow you to check a bag from your departure city to the final destination on two different tickets are Alaska, Delta, and United. Each of them will only allow you to check bags onto airline partners. I remember years ago when you could check a bag anywhere, as long as you had a ticket.

These restrictions were one of the big reasons I booked us on Delta flights to JFK to meet our Virgin Atlantic flight to London. I could have flown on JetBlue or American, but by flying on Delta, we were able to check our bags all the way to London. It’s also why I booked a United flight from San Francisco to Orlando when connecting from our flight on Singapore Airlines.

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