I flew a roundtrip to copenhagen from chicago this last weekend and on my way over there I was in such a hurry that I missed asking to get my miles posted. What can I do to get them posted, I saved all the bording cards?? Is it possible or am I a lost cause?

Sorry, you do not get AA miles on BA
transatlantic flights.

It's true that you can't get AA credit for BA trans-Atlantic flights. The reasons have been discussed at length in other threads.

However, you can get credit even if you forget to give your number before the flight. Go to aa.com, log in to AAdvantage (you'll need a PIN to do this), go to View My Miles, and click on Request Credit at the bottom of the page. You'll get a form to fill in for AA flights and instructions for handling other missing credits (partner airlines, hotels, etc.). You can also do it by mail or fax without a PIN. The folks who get the forms do their job well.

Other airlines have slightly different procedures but they all have one. Some even allow retroactive credit for flights within a reasonable period (90 days is typical) before you enrolled in their program.

Also, all is not lost with your recent trip if you changed in London. If so, you DO get full credit (base miles even count toward AA elite status) for the European flight. It's only the trans-Atlantic flight that doesn't count.

you can also fax a request with the boarding passes to AA service center.
I suggest you to enroll to BA executive club also and request credit for the mileage on the transatlantic route.

While you cannot get AA miles for a BA transatlantic, you are supposed to be able to get AA miles for BA segments intra europe from UK to CPH.

You didn't specify your routing. If on AA ORD-UK and BA UK-CPH, follow the advice in the thread about getting AA miles for the BA portions with the boarding passes. I believe it is no hassle as long as 6 months or more after the flight.

If on BA transatlantic you will need to move quickly to set up a BA account if you want the transatlantic miles posted retroactively to a new account.

Thank you so much for your help,this is no doubt the best site for travelers and the help one can get here is tryly appreciated

thanks again

Even if you can't get AA miles on the BA transatlantic flights, you may want to consider opening up a BA frequent flyer account and claim credit for those flights. BA lets you pool miles with your other family members, so it is relatively easy (assuming that you travel with your family to Europe) to get free airline tickets from them.