Before accepting a seat assignment in coach make sure to visit Seat Guru.
Look up for the aircraft and the company you are flying with and it will tell you which seat offer extra leg room but as we all know in coach it is more about not getting the worst seat than getting the best seat right!?
So look up for the worst seats on the plane, some don't recline, some have reduced legroom, mis-aligned windows ... avoid the noisy and sometimes smelly areas, to make it short this is not some kind of fantasy it is a must have on your travel check list!
+ Seat Guru