Can't say for sure, but have used CO a few times from BFS to the US. Have found them very good to deal with...customer service (particularly stateside) is generally excellent. If you are close to EDI, why not nip in and speak to a real person.
I've flown BFS - EWR - MCO and it was very straightforward. The 757s are actually more spacious in economy than VS 747s (or it feels like it anyway)...comfortable, good IFE, immigration in EWR, so once you get to MCO, it's straight to the Magic Kingdom!