Originally Posted by
Baradium
How many 767-200s are still around in passenger service vs 767-300s?
If the stretched version of one is of a similar size as the base version of another it is quite valid to compare them to each other.
By your logic the 757-200 shouldn't ever be compared to the 737-900 when discussing performance.
There won’t be very many 787-800’s in service in 20 years. Hardly any are being sold now.