I am gold with us air and united. most of my flights are made the day before I travel. this year has been terrible for me getting my usual first class upgrades. I have flown coach far too much this year. I am 6-4 and on any boeing product my knees are simply dead pressed against the seat back. I can usually tell when the moron in front of me will fail to take notice that I am quite tall and will try to push the seat back...my knees are not going anywhere and neither is the seat back in front of me. if they turn around to see the problem I am always happy to ask them how long it was going to take them to realize that the seat was NOT moving? I am a very r\frequent flyer and tall thus I am very aware that the person behind me deserves a bit of courtesy as well.
airbus product is a bit better provisioned but let's face it, some airlines like to pack the passengers in a bit tighter than others.
not easy to be tall and have to fly coach