Just be very aware of their 'exact location' PRIOR to operating slides......in/out (same goes for small dogs)
And closing of compartment doors....here kitty, kitty
Plus IF they do happen to 'escape' most cats do NOT come when called...so avoid that experience as much as possible
Cats can be taught proper harness/leash etiquette (Harness........never just leash on collar) but it takes time/repetition
Proper etiquette
Typical cat on a leash
But real reason you want your cat on a harness/leash
Close 'encounters' of the unwelcome kind