This is what @Olof suggested: We’re also testing a new vehicles overview panel. To make it work for your existing airports, open the development panel (press F10), scroll down and press the button “Claim all service vehicles”. New purchased service vehicles will be added automatically. Deterioration is not yet simulated and we’re still testing assigning of depots! 
https://forum.apoglabs.com/t/airport-ceo-alpha-0-22-3-experimental-branch-update/4516/274?u=matex
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