RE: AMA question
There are AMA guidelines for operating R/C in conjunction with full scale planes. I won't try to quote them all from memory, instead I suggest that you do some research on the AMA site. I know one significant piece of what's needed is that you have a spotter on duty when anyone is flying. This person will watch for full scale aircraft. Whenever a full scale aircraft is going to use the runway, all R/C planes should immediately land.