Ok first question why are the smaller aircraft “777-200LR” “A330-200” which pretty short in size why do they have a longer range span than aircraft such as the A340-600 and 777-300ER im so confused like doesnt a bigger plane have more/larger fuel tanks…for example the 767-300ER and 767-400ER are almost the same but 763 can fly much further,like whats the point making a larger plane that cant fly as far???
also why do some planes have weird numbers like
737-8FE or A330-313X
Like i know the engines are different but like is that all it is?