Originally Posted by
WWads
Flexibility is key. If you're flying purely business schedules, of course certs are going to be hard to use. My schedule is less traditional, so I generally have a lot of luck. Heck, I even recently cleared a mileage upgrade on DTW-ICN at booking.
All my TATL this year has been for business. Out Sunday/Monday, back Thursday/Friday/Saturday.
Point is - *some* flexibility is needed but IME GUCs have been far more usable than RUCs.