It is known that most airlines in the world do not maintain consistent services across its fleets. It is very common to have new aircrafts, like A330, A340, B777, having good interior design, like 80"+ seat pitch flat bed First Class of 4 abreast with divisions, 50"+ seat pitch Business Class with electric assisted recline seats, personal TV on all seats or even AVOD, but the old aircrafts, like B747-100/200, DC-10, A300B2/B4, A310-200, having poor interior design, like 6-abreast First Class of only 60" seat pitch, business class of only 40" seat pitch & mechanically assisted recline seats, no personal TV or even no TV in economy class at all.

This is not good to passengers at all, as the fares of travel for new & old aircrafts are about the same, but the levels of service are so different.

Some airlines, like Jetblue, Virgin Atlantic & Cathay Pacific, set good example of maintaining consistent service on all aircrafts, like presence of personal TV for all seats of all aircrafts, installation of AVOD for all passengers except Economy Class (Cathay Pacific), 50"+ seat pitch Business Class with electric assisted reclined seats on all Cathay Pacific aircrafts, 32" seat pitch Coach Class with 18" wide leather seats & LiveTV for all Jetblue aircrafts, provision of maincure & theraphy service for Upper Class passengers on all Virgin Atlantic widebody aircraft flights, and change of Upper Class seats to 60" seat pitch with inclined flat bed for all Virgin Atlantic widebody aircrafts.

This provides same high level of services for all passengers, and makes passengers more satisfied. This also explains why Virgin Atlantic, Cathay Pacific & Jetblue are so highly awarded for excellent service, and are so profitable.