VX was never a regional.
What's a large narrowbody? We were doing transcons with the smallest transcon capable narrowbody of all airlines, an A320. United had 757s. AA had 767s and then A321s. JetBlue was using Mint 321s. Delta was using mixtures of 767s and 757s. And correct me if I'm wrong, we were also the first airline to take an A320 across to Hawaii (not 321, I mean 320).
*Though before the pandemic the transcon seating was very generous, eg, 142 seats in a United 757ps, 102 seats in an AA 321T.