As you know, the waiting list priority is :
- SEN , *G (same level)
- FTL , *S
- rest of the world

Within a level, the check-in time is the
next criteria. That's why I check-in as
soon as I can (phone or web), even if I
am SEN.
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If a SEN and a *G with economy tickets compete for one seat in economy and one in business, I think LH people would choose
the SEN for upgrading !