Last week I got to try one of the more unique flights around, Qantas’s one-stop flight from New York JFK to Sydney. What makes this flight unique is that it includes a stopover at LAX, which I believe makes the JFK-LAX segment the only US domestic flight operated by a foreign carrier.
The US Department of Transportation does not allow foreign carriers to operate passenger routes solely within the United States. However, no current passenger aircraft in operation today would have the range to be able to fly from JFK-SYD nonstop (9,950 miles). So LAX is more of a refueling stop on this flight, and although tickets can be sold for departure from either JFK or LAX, Qantas is not allowed to sell tickets for just the JFK-LAX portion.