I don't want to encourage terrorism, but if someone wanted to destroy an airplane, they could bring onboard a more dangerous device disguised as a phone or othe

I don't want to encourage terrorism, but if someone wanted to destroy an airplane, they could bring onboard a more dangerous device disguised as a phone or other everyday 'black box' object such as a laptop. The dangerous device might emit serious levels of radiation, it might contain a powerful laser, it might contain explosives. The best defense against 'terrorism' is to be nice to other countries, help them and don't oppress them. Usury (national debt), bombing, invasion and economic sanctions (aka starvation) are not nice. The countries and groups that commit crimes like those are likely to be attacked. Don't be bad, and no one will want to kill you.