Flight cancellation luggage

I booked a ticket from Amsterdam to Philadelphia. This was a direct flight from American Airlines. This ticket got cancelled today and rebooked by American Airlines. I'm traveling one day later (tomorrow, December 18th) from Amsterdam to Madrid with Iberia airlines and then from Madrid to Philadelphia with American Airlines.

I checked in online at Iberia and I noticed that it said that my ticket contains 1 carry on and 0 checked in baggage, which is strange because at American Airlines I always get 1 checked in luggage for free.

I contacted American Airlines where I got a poorly English speaking person on the phone. I told her about my situation and she was real short saying something like "yeah that will be solved at the airport" which was basically all the info she could give me.

I'm sort of afraid that I arrive at the airport tomorrow and they either don't have space for luggage or I have to pay extra (which isn't a real big deal) but as you expect, I'm sort of nervous about this. What do I do and how do I handle this situation?

Also, my reservation at American Airlines says the following at my Madrid->Philadelphia trip: Baggage: CUST. What does this mean and does that have any influence on my trip from Amsterdam to madrid?

Edit for whoever cares

I made it safely to the USA without any problems. The baggage was no problem at all, I didn't even need to ask for anything. Thanks for everybodies help :)

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What happens to luggage when a flight is Cancelled?

The airline will reroute your checked bag to your destination (or wherever you ask them to) as best it can, and it will deliver the bag to you at no charge (although you may wait a day or two or even longer, depending upon how bad the delay is).

Can I cancel my checked baggage?

The good news? YES you can get a refund on your checked baggage fees.

Will airline reimburse for Cancelled flight?

The airline is required to compensate you for a canceled flight if you were notified less than 14 days before your original scheduled departure date. However, compensation is not required if the airline proves that extraordinary circumstances (e.g., weather) caused the cancellation.

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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Kelly, Kelly, JESHOOTS.com, Gustavo Fring