Airlines have been using 777-200ER's as replacements for 747 "Classics" i.e. the -100 & -200. They also use them to down-gauge at off-peak times; KE
did this on their IAD
) route and NH
did it on IAD
due to reduced demand.
is an excellent example of using a 772ER instead of a 744 for economic reasons, on EWR
: not a big enough market for them to justify the capacity of a 744; 772ER better economics in general vs. a 744 especially once you factor in the aquisition or lease cost of having to get 744's in the first place. We will see more of this once the new 777-200LR goes in service with PK
. Allows airlines to serve ultra-long-haul niche markets without too much capacity.