The very large airplane: safety, health, and comfort considerations. Air Transport Medicine Committee, Aerospace Medical Association

In recent years, aircraft manufacturers have been considering a very large airplane with a capacity of 600-1000 passengers. The human factors aspects of such an unprecedented enterprise demand that the aerospace medicine community take an active role early on in the design phase. Consequently, the Aerospace Medical Association formed an international task force to prepare a paper containing pertinent human factors recommendations for the manufacturers. This paper, including the recommendations herein, has been forwarded to Boeing and Airbus as well as to 50 major airlines of the world.

Published by Aviation, space, and environmental medicine, 1997. The guideline itself is at the source linked here.

pubmed.ncbi.nlm.nih.gov/9327122/