@wakmen thanks for this info!
i added the numbering as a wink to when the 747 was an MCI coach, the 3 first digits read 74-7 and i found it a neat easter egg

hey, thanks for the share! I am a 747 driver! If you would like the bus number to be accurate for the new flyers it would be 40-9xx 41-9xx 42-9xx ect. the first 2 number is the year of the bus + 20. so a 40-xxx bus would be 2020 and the first number of the second part in this case 9xx, would be for full electrical bus. 8xx for articulated bus and of course the last 2 digits for the unit number.