Very good article, thank you, but there is another problem that has been cropping up with horizontal flyers and it's the large Tracking suits. I am currently at a DZ in Northern Europe and our only aircraft is a Twin otter, and of course we put AFF's and Tandems on the loads. We put Trackers out first and Wingsuiters out after the High opening AFF and Tandems. There has been some confusion as to where those wearing large tracking suits should exit, and they are often just before the WS'ers and after the Tandems. I have had inexperienced jumpers who are tracking without a suit attempt to exit after me on my Tandem or AFF telling me trackers go later (as has become acceptable with those tracking in PF and Tube suits ) personally I don't even want a jumper in a tracking suit to follow me as I don't consider him to be in the same slowfall category as a Wingsuiter.I know some DZ's have the TMs exit first, but overall I don't agree with this. And we have tried to keep a policy of no more than two tracking groups per load, although manifest doesn't always catch this. Anyway, Great article, Thanks.