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Primary radar[1] is only mostly used in larger airports or military installations. Secondary radar like ADS-B[2] has become really popular and requires the transponder on the plane to be on and working. If you switch that off, for a lot of people you do disappear.

1. https://en.wikipedia.org/wiki/Primary_radar

2. https://en.wikipedia.org/wiki/Automatic_dependent_surveillan...

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