Pilots are already expected to deal with all sorts of emergencies. Will never happen: 0. Guidance signal loss 1. Guidance signal jamming 2. Guidance signal

Pilots are already expected to deal with all sorts of emergencies. Will never happen: 0. Guidance signal loss 1. Guidance signal jamming 2. Guidance signal hijacking 3. Pilots on the ground don't have a vested interest with passengers, so the survival instinct won't necessarily kick in because they're not there. 4. Cost of mitigating all of the above would be much more than the risks of such a drastic change.