[t90fan]

Scanning can lead to arrest in some places.

In the UK for example, the computer misuse act says that using any tool with the intent of accessing a system (without actually doing so, let alone doing so successfully) is an offence.

[blincoln]

It could easily be interpreted as a CFAA violation in the US as well. I'm a professional pen tester, and there's no chance I'd port-scan any system on an aircraft without permission.

[lordlimecat]

It's almost like theres a reason every computer security class and every scanning software written has a disclaimer saying "NEVER SCAN A SYSTEM WITHOUT AUTHORIZATION".