Picture this. Commercial aircraft cruising at FL180. Base of CAS FL175. As far as I'm aware (in this case) aircraft can safely cross at FL175 without any separation implications. (Perhaps there are other caveats to that please corret me if wrong).
I am concerned, however that particularly military aircraft are within their rights to execute a rapid climb to a level 500ft beneath a commercial aircraft in these circumstances causing a TCAS RA which has the potential (however unlikely) to injure (or worse) those on board the passenger aircraft. Although common sense may tell you not to execute such a manoeuvre beneath a passenger aircraft, it does happen. Is this a problem ? Perhaps I'm overreacting. It wouldn't be the first time
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Any thoughts ?
P.S. (Chewbydoo ? There you go. Now you can explain your bizarre answer previously because I have absolutely no idea what point you were trying to make. Perhaps you misunderstood the question initially).