I watched this video about passenger aircraft length.
It says the longest passenger aircraft is Saudia's 777-368ER.
Saudia web site says their 777-368ER is 78.86m.
But according to boeing web site, 777-300ER is 73.9 m. https://www.boeing.com/commercial/777/#/technical-specs
Is 777 be able to modificated length as customer option?
I couldn't find any news souce about Saudia purchased modificated long 777.