Space Shuttles

what happens when shuttles missions reach 0 ? they simply dissapear? what happens if they reach 0 while traveling with cargo?

i cant seem to find where you can destroy them manually before they reach 0 missions

They disappear over time, not immediately. When you use the automatic space transport page, it won't use shuttles with 0 missions so there is no risk.

thanks

There should have been a message warning you ahead of time.

basically, when they are very close to zero, they disappear.