If you are using the Amadeus CheckMyTrip site you can see all the different reservation numbers at the top right of the screen for each different airline in the booking. I find having a copy of these to hand for more complex itineraries sometime useful if you run into problems on-route.

CheckMyTrip together with the InfoRetriever link to sync the booking with a calendar, linked to a Blackberry, is invaluable in todays paperless e-ticket era. ^