Okay, perhaps I'm missing something, but what are these level based on? Popularity? Capacity?
Is a D attraction better than a C? Trying to learn this terminology.
It refers to the original ticket books that guests bought. They were ride coupons and you only had so many A's, B's, C's, D's, and E's. E-Ticket were the biggest and best.
For example, the following required the following tickets at some point or another:
A: Omnibus, Horse Cars, Main Street Vehicles
B: Swiss Family Robinson Tree House
C: WDW Railroad Steam Train, Peter Pan's Flight, Toad, Snow White's Scary Adventures
D: Skyway, Country Bear Jamboree, Hall of Presidents
E: It's a Small World, 20,000 Leagues Under the Sea, Jungle Cruise, Haunted Mansion
Of course, this has all now changed (and it's really all relative to the person now that the ticket books don't exist), but I believe the terminology is still used inside the company.