In the future, I wonder if it is worth trying to purchase the ticket using the mutiple destination option and choosing "LGA-CLE," "CLE-FLL," and "FLL-LGA"? I just threw sample dates of 1/25 and 1/27 into the computer, chose 1251 outbound and 484/3196 on the return, and it priced as $303 either way. The mutiple destinations option showed flight 1251 as two different segments with 500 and 1062 OnePass miles each, whereas the simple roundtrip option showed 1076 miles on the outbound portion of the journey.

This whole "single flight number" business is ludicrous since we all know that the "flight number" means almost nothing when it comes to deboarding and changes of planes.