Corvus is exactly correct. The lack of access to Frankfurt puts a lot of pressure on operators and crew. I do not know the landing distances required for a C750 but I would surmise marginal, putting even grater strain on the crew. Together with the reducing visibility and the "unuser friendly" ATC enviroment there once you are out of the system it was all the cheese holes ligning up perfectly.
The people who regulate the slot sytem at EDDF must take the moral blame for this and more will happen unless GA is given a fair access to slots for what is the only really suitable airport for Frankfurt. But I guess they do not care for morality, only profit.