Originally Posted by DCAproducer

Welcome to Delta IT. While the ordering ahead has gotten better, it's not perfect. I've gotten on flights where the FA's tell me they got my order, but the catering was completely different. In D1 it's pretty standard to get a beef, fish/chicken, and one vegetarian option.

By the way, one other way to confirm if you're on the D1 flight is look at the seat map and aircraft assigned to the route. If it's a 75S, it's a D1 757.
Obviously there can be an equipment swap, but the D1 equipped 757 is the only one with 16 seats up front.