Well, as usual, a lot of opinions, with no facts, such as citations to the CFR or US Code.
Here’s an old post to dig up from out of the mud! But in the interest of closure, I wanted you to all know I found the answer!
Looking through the Bolingbrook anniversery calendar at work today, I noticed one month was dedicated to Clow Field. According to whoever wrote the calendar, Clow International airport was named as such because the pilots were Czech, Polish, Swedes… etc. So apparently, you don’t need to do anything to call yourself an international airport except have a poor sense of humor.
Or else Clow is in violation of some FAA ruling.
I can tell you one thing. When you sail your boat into another country , you cannot just go to any port, you have to first clear customs and immigration at a port which has such facilities. It is the same coming to the US, you first have to clear at a port that has customs and immigration. I would think this would be the same for airports and you cannot just fly to any airport but only to one that has the required bureaucrats.
T.F. Green International Airport in Providence (actually, Warwick), RI is not open 24 hours a day. The concourse is closed from 1-5am, and the outer area is (I believe) closed off except for people whose flights got cancelled. I know, I slept there once, and they woke me up at 1 to tell me I had to move. Why, I have no idea.
But anyway, the upshot is, it’s not open 24 hours. It does, however, have a customs agent.