This bug comes up every single time a game starts.
And Sami has said that it's working as intended, but even his explanation that he's provided a couple times, doesn't apply to these circumstances.
Certain airlines, some how, are able to place 3 separate orders on the first day of a game.
Is it a big deal? No, since they're new planes it'll be months before they get them anyway. Unlike Used planes, which have a tight market on the first day, with new planes there's really no difference in whether they ordered the planes now or waited until Day 2 to do it.