Martin, very nice that you take care of the Airlift monument at FRA. I was there one time when I stayed in the Intercity Hotel nearby. I walked to the spotters location and passed the monument and made some pictures of the DC-4 and DC-3 (C-47).
Keep up the good and honourable work you do.
After the corona restrictions subside, I want to visit FRA again. Maybe I can meet you then.