I did fly Lufthansa (twice) and it was an interesting experience. They counted in minutes how timely their takeoff and landing was on both flights. Aloud as they strolled through the aisle.
My grandparents were from Germany as well. Dinner was at 6pm. Not 6:01 pm or 5:58 pm.
I can also add that I have never been in a Luftwaffe plane when it landed.