Agent Hotchner: This is Special Agent Dr. Reid.
Man: You look too young to have gone to medical school.
Agent Reid: They are PhD's. Three of them.
Man: What, are you a genius or something?
Agent Reid: I don't believe that intelligence can be accurately quantified, but I do have an IQ of 187, an eidetic memory, can read 20,000 words per minute...yes, I'm a genius.
Reid: Can one of you do me a favor?
Morgan: Sure kid, anything you want.
Reid: Can one of you at least look like you're going to see me alive again?
[Hotch has just been strangled.]
Gideon: Take your tie off for once in your life.
Chosen answer: Black SUVs are common police, military and dignitary vehicles around the world. It is not too much to assume they could be rented or owned by the police forces in the areas.
kristenlouise3
Other people have explained it but fore more information, federal cars would most likely be brought to the airport from the nearest agency, so they can drive out to their locations especially in rural situations.