Originally Posted by
The Wolf
The guest rule only counts departing with LX, not arriving. I found out the hard way trying to get a colleague into the FCL in Zurich.
I've had some luck guesting a fellow FTer into the ZRH SEN with an arrival boarding pass (each) - but that was definitely a nice gesture and not allowed by the rules albeit funnily enough his boarding pass also flashed green after scanning. (Guess having flown plenty of times and seen the lounge staff several times in the week before did help) - it's something you can always try. But probably with better chances at SEN rather than FCL..