Originally Posted by
ngls
My girlfriend is about to fly standby on Lufthansa from Athens, Greece to JAX. I would like to know if any of you is familiar with this type of tickets and what happens if the flight is full.
If the flight is full, then nothing happens -- you stay behind for hours/days/weeks/etc. until there is space or until you decide to purchase a revenue ticket

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Originally Posted by
ngls
The itinerary we are thinkikng of is ATH-FRA-ORD-JAX on the 19th or 20th of October. The flights that would be the best schedule-wise are:
ATH-FRA LH 3385
FRA-ORD LH430
FRA-JAX LH9224 (Codeshare with UA)
Can you please let me know the loads of these flights as well as any information on standby tickets because it'll be the first time she does it.
Which airline does your GF work for? She really should be contacting the appropriate department within that airline regarding ticket validity, routings, etc.
Originally Posted by
ngls
If the flight is full do they reaccomodate you in another flight via another routing or this is impossible?
Nobody will "reaccomodate" a non-rev PAX, she has to re-accomodate herself.