T1bub,
Watch LITT... since you probably don't have 3-day trips in your schedule, open up the board of somebody who does, then click on LITT with his #, and see what 3-day trips are sitting in LITT. Same with 4-day trips. The ones that are about to drop out of LITT & into DOT are the ones that (if scheds doesn't split them & nobody picks them up from DOT -- usually a bit hard to add 3 days at a time) will go to the EF/VJA/Reserves. And you're right, it almost always is the weekend trips. Look at LITT for this month, and you'll probably see that every trip in there pays about minimum rigs & covers a weekend. There's a reason it's in LITT instead of on somebody's schedule!
That's why there are more weekend reserve blocks in the bid lines than weekday reserve blocks: more unwanted trips (as in, traded into LITT & never picked up, and nobody wants / can take them thru Extra Fly) end up there than anywhere else.
I think what you're seeing in BWI is a common deal, not just there & not just now: weekend reserves fly more than weekday reserves, even though there are more weekenders.
It'll be interesting to see if ELITT changes that dynamic, and by how much.
Snoopy