It's a feature. During busy hours passengers are even directed to security screenings in other "Terminals" (mainly happens between A<>b) for a couple of years now (since the airside connectors between A & B and the newer one between B & C opened).

I also can confirm the the scanner only scan if it is a boarding pass and I use the checkpoint with the shortest queues.

And this means the scanner at the priority lane does not know if your have status and / or are entitled to use the priority lane ;)

You are free to use any of the three security checkpoints. Depending on where I park my car and the time of the day I use either A or B for any LH or AB flight

Same here. Normally A is terrible in the morning even at Fast Lane.

Not checking for the "correct" concourse is actually not a bug, but a feature. From the time they finished the airside connection between all three concourses, they even encourage you to use a different checkpoint if any of them seems to be overcrowded by placing billboards in front of the concourses.

However, the priority BP check is really annoying - there usually is an attendant at all BP checks in A (both priority and non-priority), but they really seem to be paid for just sitting there. Two weeks ago, there was a huge 15-minute queue at both the prio and non-prio security, and the prio queue snaked all the way back to the non-priority entrance. Still, quite a few people entered through the prio scanner and tried to squeeze in somewhere at the front of the queue. People around me started complaining quietly, until at some point I shouted "Excuse me, please!" Then, everyone started complaining loudly to the attendant, but she only shrugged her shoulders and told one of the entering people to go to the end of the queue, and then disappeared.

Hi folks, I'm trying to get from SFO to Corfu, and part of the itinerary is a stop in DUS with only a 45m layover. I'm coming in on Lufthansa LH 2014, and leaving on Eurowings EW 9612. Is 45m enough for this? It seems very tight, and I'm guessing since they're not the same airline I'd need to retrieve my luggage?

Hi dshack - It seems you're routed SFO-MUC-DUS-CFU. If this is on one ticket then your luggage will be routed to CFU and you don't have to retrieve it in MUC or DUS.

45 Minutes in DUS is tight but doable. Have hand luggage with clothing etc. for 2-3 days with you as your bags might not make it.