One ticket, two airlines, bags not checked to final destination
Who is responsible for compensating me for my rebooked ticket to Istanbul? 
My return ticket(see attachment) booked through Expedia UK on a single itinerary was on two different airlines. Aeromexico agent would not check my bag from Mexico through Amsterdam to my final destination...Istanbul, Turkey, on Turkish Airlines. He said they were not parter airlines. The flight was diverted and late arriving to Amsterdam and I had to pick up baggage to recheck on Turkish airlines (through passport control etc).Consequently, I missed my flight to Turkey and had to purchase an expensive ticket next day to get home. Expedia did not disclose on the ticket issues with two different airlines, but says Aeromexico is responsible. Aeromexico says they are not responsible to refund a flight on a different airline that it is Expedia UK's problem.
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Are bags always checked to final destination?
Your baggage is almost always sent to your final destination. There are some exceptions, such as North America, Australia and South Africa. If you have a transfer there, you must always collect your luggage at the baggage claim and check in again for the next flight.Do I have to recheck bags on a connecting flight with different airlines?
It depends on how your ticket was booked. 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.Can you check bags to your destination with two different reservations?
Unfortunately, there is no way to ensure that your luggage will be checked through when traveling on two separate tickets.Do I need to collect my baggage for connecting flights?
If your bag is tagged to your next or final destination, you may need to pick up your bags and place them on the connection drop-off belt. If it is not tagged to your next or final destination, then you will definitely need to pick up your bags and check them in for your next flight.Lost luggage: What happens to your baggage after check-in
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