There have been reports (I forget which forum, probably disboards.com) of Song flights on which they ran out of food.
The problem continues to exist: either running out or having leftovers that go to waste.
With Song's quick turnover from one arrival to the next departure, surely they should be able to come up with some scheme where leftover food is served on thenext flight.
Travel tips:
http://members.aol.com/ajaynejr/travel.htm