In other but closed post of this forum [earnorbust] write, about FSTramp :
“Although not noted, the program also assembles external puchased sceneries assigned to the “Community” folder!”
In the main FRTramp main page, it is writed : “Addon scenery which has been added to your scenery library, is also displayed on the world map.”
Question : How to import addons airports the the FSRtamp data base?
Thanks.
Better off asking this in the ‘Third party’ subsection.
Thanks, @MortThe2nd . I just moved it. 
Hi @jpfil , welcome to the forums! The best place to ask that question is in the category, #third-party-addon-discussion:tools-utilities , where I have just moved your post.
Please keep in mind, however, that this section is not an official support channel for any third-party add-ons.
If you dont have an Answer yet, here it is:
With the FS Tramp Scenery Assembler. Its included with the Installation.
Just run it from the Start Menu.