Just edit your Content.xml …you can disable everything if you change from “activated” to “UserDisabled”
I edit mine to get rid of all default vintage and action planes … now im happy that i just have 5 planes left, you can also get rid of all other “arcade” stuff or whatever you dont want to load 
like this
<Package name="fs20-asobo-aircraft-pipistrel-livery-xbox-aviators" active="UserDisabled"/>
<Package name="fs24-asobo-aircraft-pitts" active="UserDisabled"/>
<Package name="fs20-asobo-aircraft-pitts-livery-aviators" active="UserDisabled"/>
<Package name="fs20-asobo-aircraft-pitts-livery-xbox-aviators" active="UserDisabled"/>
<Package name="fs24-asobo-aircraft-pitts-s1-reno" active="UserDisabled"/>
<Package name="fs20-asobo-aircraft-pitts-s1-reno-common" active="UserDisabled"/>
<Package name="fs20-asobo-aircraft-pitts-s2-livery-kenmore" active="UserDisabled"/>
<Package name="fs20-asobo-aircraft-pitts-s2-rufus" active="UserDisabled"/>
<Package name="fs20-asobo-aircraft-pitts-s2-sam" active="UserDisabled"/>
<Package name="fs24-asobo-aircraft-savage-cub" active="UserDisabled"/>
<Package name="fs24-asobo-aircraft-savage-shockultra" active="UserDisabled"/>
<Package name="fs20-asobo-aircraft-savage-shockultra-livery-aviators" active="UserDisabled"/>
<Package name="fs24-asobo-aircraft-savage-shockultra-livery-kenmore" active="UserDisabled"/>
<Package name="fs20-asobo-aircraft-savage-shockultra-livery-xbox-aviators" active="UserDisabled"/>
<Package name="fs24-asobo-aircraft-skyship600" active="UserDisabled"/>
<Package name="fs24-asobo-aircraft-sr22" active="Activated"/>
<Package name="fs20-asobo-aircraft-sr22-livery-01" active="Activated"/>
<Package name="fs20-asobo-aircraft-sr22-livery-aviators" active="Activated"/>
<Package name="fs20-asobo-aircraft-sr22-livery-kenmore" active="Activated"/>
<Package name="fs20-asobo-aircraft-sr22-livery-xbox-aviators" active="Activated"/>
<Package name="fs24-asobo-aircraft-t6-reno" active="UserDisabled"/>
<Package name="fs20-asobo-aircraft-t6-reno-common" active="Activated"/>