What are "stand up" lines, and why are you so altruistic towards your junior pilots regarding a LOA or are you just independently wealthy?
Stand up, aka
All-nighter's
High-speeds
CDO's (Continuous Duty Overnights)
Naps
A trip that originates in domicile, typically flies one leg out at about 9-11 at night, has less than legal rest in the hotel (5-7 hours), then flies back to domicile at some unGodly hour like 5 or 6 in the morning. They're continuous duty, which is what makes them legal, with legal rest occurring during the day.
If you nap during the day, shower and shave before going out, sleep 4 hours in the hotel, fly home, and nap again, these can be great if you live in domicile. Personally, I hate them, because I'm not one of those sleep/nap kind of people. I need 7-8 hours of ACTUAL SLEEP or I become a very grumpy person. PCL is one of those people who likes them.
A stand-up LINE is one built with JUST these trips. Those lines are becoming more and more rare because, by airTran rules, you can't do more than 3 of them back to back, must have 3 days off in between them, and get paid 70 hours for 40-50 hours of actual block.
What they're starting to do is mix them, which is questionably legal per the contract. They're not supposed to be mixed, they're supposed to be CDO lines or regular lines. They've also been known to front- or back-load them, which means you have 2 legs at night, or (worse) 2 legs in the morning; these are brutal and I would likely have to call fatigued if I had two of these back-to-back, my body just can't do it.
A mixed line is where you'd have one week of stand-ups, then one week of a 4- or 5-day trip, then another week of stand-ups, then a regular 4- or 5-day trip, blocking and crediting right at 70 hours, which somewhat defeats the purpose of flying CDO's (credit more, fly less).
As to why PCL can take the LOA, he probably has something else he can do on the side, just like we were talking about earlier. He'll have to chime in later (he's probably flying right now).