Rocade
The controllers at the Centre are also interested in the aircraft type, and the Tower controller can pass on any type change either electronically or by telephone. Several en-route ATC systems use a flight path and performance prediction model that is tailored to aircraft type....and a whole range of additional factors are included in performance modelling.
There are significant performance differences between seemingly similar aircraft such as A319/A320/A321. As a salute to a colleagues post above [fireflybob] I can understand the request, because I've worked Trident 1/2/3 and believe me the Trident 1 climbed like a brick.....but you couldn't catch it. I think Northeast used Trident 1E which performed better.