Looks like DL will start to offer economy meals to order on select transcontinental flights. Orders can be placed before flights:

https://www.delta.com/traveling_chec...ss/premium.jsp

Menu can be found here: http://delta.dineup.com/eatsMenu.action?menu=3

Prices seem to be between 10 and 15 dollars.

Seems like a good initiative to me and hopefully it will be offered on other flights as well. ^