If you are unable to read the tail numbers that you will be flying on. You can ask one of the F/A or the pilot for the tail numbers. I am sure they will be very happy to help you for the tail numbers. Also, before you will be flying on the aircraft...you can look at the fleet numbers on the nose door.
Hope this helps,
John A. Perrotta (KBDL/BDL) - Canon 300D/400D & EF 75-300mm f/4-5.6 IS USM