I'm 6'4" and economy plus is too small for me. The only way I can fit into the seat is in a completely upright position with my knees pressed into the seat in f

I'm 6'4" and economy plus is too small for me. The only way I can fit into the seat is in a completely upright position with my knees pressed into the seat in front of me. It gets even worse once the person on front of me reclines his/her seat. It's physically painful for me to stay in that position for more than 1-2 hours so I'd only do a business class for long haul flights. And of course business class is very prohibitively priced for me personally so I avoid flying long distances at all. If the company wants me to fly somewhere further than 2 hours away, I will demand a business class seat. Otherwise I will tell them I'm not going for health reasons and they should send somebody smaller who can fit into the tiny seat more comfortably.