Essentially, a codeshare flight is an agreement between airlines to sell seats on each other's flights. This gives the appearance of airlines flying to more destinations. By doing so, the airlines typically share the revenue on that ticket.
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But using the PNR for the operating airline, you can call reservations at the operating airline and request a seat assignment. You may also be able to do this online by looking up the itinerary with the PNR and your last name.
In most cases, if you have a connecting flight with the same airline or a partner airline, your checked-in luggage will be transferred automatically from one aircraft to the other. This is known as interlining or through check-in.
If your flights were booked under one ticket, your bags will be checked through to your final destination. If your flights were booked under separate tickets, you will need to collect your bags and recheck them before your connecting flight.
Federal law doesn't require airlines to pay compensation to passengers for delays, Palmer said. If airlines cancel a flight for any reason, passengers are legally entitled to a full refund, including for ticket price, taxes, baggage fees, extra charges and ancillary fees.
Arrive to airport 2-3 hours before the flight, and check in there. Go to the check-in desk of the first airline you are flying with. They will give you all boarding passes for connecting flights.