From a book called “Body space. anthropometry, ergonomics, and the design of work” by Stephen Pheasant. My ergo prof said to get it and I didnt know if I should or not. I bought it, and have referenced this book more times than any other book I own.
airport seating is like side chair seating, but there is a bit more rake in the seat towards teh rear. iirc, it’s 5-10 degrees. the rear shouldn’t be as low as lounge seating, but it’s in the middle between the two.
Are you sure the brief is to design a comfortable chair that people can sit in for extended periods of time?
The new terminal at Heathrow has only ~200 chairs for millions of people to use every year - the key reason being BAA makes most of their money from the duty free shopping, and people wont shop if they have a comfortable place to sit. So I imagine the chairs were selected specifically to be uncomfortable for anything other than a brief break.