CRAF´s conclusion on the question, if we can solve coordination between space systems (space-to-Earth) and airborne applications by specific agreements between Radio Astronomy stations and operators of these space/airborne systems:
CRAF concludes that CEPT should not support pan-European coordination agreements between radio astronomy stations and operators of applications in active services. In Europe, coordination agreements between radio astronomy stations and operators of aeronautical and space systems are not practicable because of the associated complex, and sometimes even unsolvable, problems. General procedures for the completion and enforcement of pan-European agreements cannot be developed of date, due to the different regulatory implications for the different kinds of applications that could be considered.
In Europe, coordination should be retained within the current national, European Administrative structure(s).
Find the full explanation and conclusion of CRAF here.