AviationBanter - View Single Post

**Alan Erskine[_4_]** · November 21st 11, 11:25 PM posted to alt.binaries.pictures.aviation

On 22/11/2011 9:52 AM, wrote:
First, what qualifies an airport as an "international" airport? I've seen or
heard of some "international" airports that don't seem to be able to handle
worldwide flights. Maybe I'm wrong.

Second, on many, if not most or all airliners, what is the small round opening
in the very tail that almost looks like an exhaust?

Thanks.

The latter is usually an vent or an exhaust for the APU (Auxiliary Power
Unit) - not on all aircraft, but quite obvious on the 737.