I have several event arrival in work, and Nagoya glitched and gave them all when I only own 6 s stands, will I lose them after their landing timer runs out?
Yes, you will lose them
They are level arrivals as well so no big loss, thanks for the info
Sorry this happened to you 
In my experience, these arrivals don’t enter the holding slots unless you have the correct type of stand. I know connection flights appear but special arrivals shouldn’t.
It glitched when I went and bought all arrival slots + the three other small stands that aren’t built when you start