I think that the code in Q post 1699 is for jets https://www.jetphotos.com/photo/8940747 specifically the first one pictured

So (speculation) Q in posts number 1698-1699 is reminding the feds of their oath because of https://www.wsj.com/articles/national-enquirers-years-long-dealings-with-trump-lawyer-fall-under-federal-scrutiny-1532534115