Umberto,
It's not a big deal, but I wondered why KDFW and if I remember correctly most of the other airports dont have any rotating beacons? I was at Founders Plaza last night at KDFW watching planes landing and taking off and noticed that their rotating beacon is on the red tower at Founders Plaza. In the FSDT version of KDFW, Founders Plaza is there along with the red tower, but it doesn't have a beacon on it like in real life.
Thinking about it, I dont remember seeing any beacons at any of the other FSDT airports as well, unless you need the scenery complexity slider set to a certain level to see it. Generally, I leave my slider set to Dense or Very dense depending on the airport I am flying into.
Like I said, its not a big deal because I dont need one to find the airport, but was curious as to why they aren't in the sceneries.