Lifeguard flights: How to file a flight plan?

"Steven P. McNicoll" wrote:

"Chris" wrote in message
...

Doesn't using an LN prefix make it ambiguous with a Norwegian
registered aircraft's tail number?


No, as Norwegian registrations are all letters.

I have not see any, but I believe Norway has the option of using all numbers
if they wish, in addition to all letters.


I believe all nations use
letters exclusively after their national registration codes except for the
US and Liberia.

That's not true, numerous other countries use numbers in their aircraft
registrations. (see below for examples)

TRIVIA: When Braniff was operating Concordes for domestic US service, the
British Airways or Air France planes needed to be registered in the US for
legal reasons. The plane would temporarily be "sold" to Braniff, the
paperwork stowed, and US based paperwork (airworthiness cert, registration,
etc.) produced. For example, a Concorde was registered in the UK as G-N94AA.
(Note letters & numbers in the G registration!) When it operated for
Braniff, they obscured the G, so the registration was now N94AA. Of course,
Braniff pilots flew the planes when registered in the US. I believe 5 UK
planes were outfitted with this type of arrangement, and 5 Air France
Concordes or so had something similar.


Japan uses numbers. For example, see
http://www.airliners.net/open.file/550331/L/
http://www.airliners.net/open.file/551061/L/

Vietnam uses numbers with letters
For example see:
http://www.airliners.net/open.file/551074/L/

South Korea uses numbers in their registrations
For example see:
http://www.airliners.net/open.file/545888/L/
http://www.airliners.net/open.file/531784/L/

Columbia uses numbers:
http://www.airliners.net/open.file/550586/L/
http://www.airliners.net/open.file/541123/L/