Great question — answering as the UphillTech team:
can I just go straight to the airport on Tuesday Yes. You can go to the airport whenever your want unless it's closed. and literally wait there ... till Friday? You can stay landside as long as you want provided the airport doesn't close at night or security personnel kicks you out. It's unlikely that you would be allowed to go airside (through security) until Friday. Typically this requires a same-day boarding pass. ... in the lounge ... If you are talking about airline or contract lounges, the answer depends. All lounges require a same day boarding pass and many contract lounges don't allow you to enter more than 3 hours before departure. Your chances of getting into a lounge before...
Full answer by Hilmar: https://travel.stackexchange.com/a/193234 (CC BY-SA 4.0).
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