Typically, airline reserve flight number “1” for their flagship route.   After obtaining several Heathrow slots from Air France, Delta inaugurated DL1 from JFK to LHR (London Heathrow).  Recently I had the opportunity to travel on DL1.   For me, the über aviation geek, it was quite enjoyable.

Other Notable flagship routes:

Continental Airlines, CO1: Houston (IAH) to Honolulu (HNL)

American Airlines, AA1: New York (JFK) to Los Angeles (LAX)

United Airlines, UA1: Chicago (ORD) to Honolulu (HNL)

US Airways, US1: Phoenix (PHX) to Chicago (ORD)

Turkish Airlines, TK1: Istanbul (IST) to New York (JFK)

Lufthansa, LH1: Hamburg (HAM) to  Frankfurt (FRA)

Japan Airlines, JL1: San Francisco (SFO) to Tokyo (NRT)

Korean Airlines, KE1: Seoul (ICN) to Tokyo (NRT)

Those who know me, know how much I enjoy aviation.  Its really my one and only true passion.   Here is a group of similar minded people who are bringing back the “goose” a multi-use, multi-purpose amphibious flying boat.   Here’s there website…Antilles Seaplanes