Closest Airports: They're all so Foreign!

The closest airport function on the DATA page makes finding an airport easy. But when I select the closest airport prompt, everything is so foreign!

What in the heck are those 4 letter identifiers?

RJAA, EGLL, PANC... Where in the world are those airports?

If you know the first two letters, you'll know where the airport is...

• EI:   Ireland (Europe, Ireland) 
• EG: England, Scotland, or Northern Ireland (Europe Great Britain)
• LF:  France (Lower or Latin Europe, France)
• LP:  Portugal (or Islands owned by Portugal such as Lajes--LFPA)
• BI:   Iceland (North Atlantic... Brrrrrr)
• BG: Greenland.
• C:    Canada
• P:    USA Pacific region. 
• U:    Russia. (USSR)
• RJ:  Japan.
• RK: Korea
• Z:     China Z Heck if I know... do you?

ON a side note.... Did you know if you've leveled off before you've reached cruise and you press DATA and select closest suitable airports that you won't have any data for those airports? You'll need to re-cruise yourself and all the data will appear. 

Enjoy the Journey!

~ Karlene