I was wondering the same thing. The other day we were stuck at an airport because were only aloud to use the runway in one direction and we couldn't because of the maximum tailwind component.
So we explained our delay to our passengers and the next thing that happened is that a 737-800 on our right hand side accepted the tailwind and left.
Some of our pax noticed that and questioned our explanation. Then a 767 on our left told the tower they could accept the steady 15 knot tail wind and left....
Some of our passengers acused us of lying.
But do these boeing airplanes have higher tailwind limitations? Or were they just "flexible" pilots?...
the aircraft has been tested up to 15 knots, but it is operationally approved for 10
Maybe that is because of the 50% margen that is required by law...