I'm flying to Chicago next week and my booking shows the route operated by a 343 - but its been a 346 for the last four days - VWIN - Lady Luck - so will my luck hold? Or is it the luck of the draw.....?
have a look in the schedules in the toolbox and see if there is any sort of pattern yo can work out. Just because it's been a particular plane or type of plane the last few days dosent mean it will follow that pattern.
It will in the end come down to loads and the most efficient plane that meets those loads. Why send a larger plane if a smaller one will do?
BTW have fun in Chicago. I'm going there next month so please leave it in the condition you wold wish to find it in !