"TSA" on BeNeLux/German borders
Morning,
I'm planning a flight from the South East (UK) to the Czech Republic and have been using SkyDemon. En route I keep getting red warnings that my route transits TRAs and TSAs all around the BeNeLux/German borders. A google search has helped with with TRAs but any search for TSAs brings up US security measures! Can anyone help me with what these are and whether I need to avoid them or whether I can request a transit - some of them are SFC-10000 so climbing over is probably not an option (in a 152) and I'd be interested to find out what they are anyway.
Many thanks
SU