I'm not sure if the information on DL's website is accurate or not, but it mentions complimentary meals in Y for International and Hawaii/Alaska.
We offer complimentary meal service on most international flights (approximately 6 hours or longer) and select flights to Alaska and Hawaii. Special meals are available on flights where complimentary meal service is offered.
Source
Is that true? If so, from which airports, and what kind of meals are served?