Apologies if this has been discussed. I was flying a longer sector on WN (3+ Hours) and was surprised to see the equipment was a 300. I then flew a very short segment and it was a 700. Doesn't the 700 perform a lot better , as far as fuel burn goes, on the longer sectors ? The 300 also had no winglets - I know winglets are more advantageous the farther your fly.
Do I have this backwards or is WN short on 700s for longer flights ?