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The Post Office Department designated any contract air mail route flown by
an airline into/from a foreign country into/from the US as a "Foreign Air
Mail" route. The Foreign Air Mail routes became known as FAM's.
FAM-6: FAM-6 was awarded to Pan
American Airways.
Pan Am inaugurated FAM-6 on
January 9, 1929 using land aircraft including the Fokker F-10, Ford Trimotor and
the Fokker F-7 between Miami FL, Cuba, Dominican Republic, Haiti and Puerto Rico.
Various Pan Am pilots including Edwin C Musick, CD Swinson, Basil L Rowe and RH
Fatt piloted these inter-island Caribbean flights. FAM-6 would eventually extend
onward via the Caribbean Islands to northern South America and down the eastern
coast of South America to Brazil and Argentina. FAM-6 when combined with FAM-5
would come to be known as the "Lindbergh Circle" with flights
circumnavigating the Caribbean Sea. source http://www.aerodacious.com/