These latches will get lost during your or the airline handling of the crate during your travels. They are a bit pricy and hard to find.The airline company will not accept a default crate and you won't be allowed to travle. Keep a few spares in your suitcase (not in the compartment of the crates, as they will get lost to)

These connector will get lost during travels with your dog/pet. During assembly by either you or the airlines, they will disappear or breake. They are hard to come by original.

These clips will get lost in the airport at some time during your travels with your pet. They are hard to come by and the wheels are useless without the clips. Some airlines do not allow wheels on the creates and they have to be removed at pet handover.