Keeping planes safe
Some simple steps for preventing terrorism on planes: Ban all drinks. Have the flight attendants serve enough drinks for free or for a nominal fee. Ban all MP3 players. Let people upload their music to an airline's Web site, and listen to it on airline-issued headphones during the flight.
And so on.
Most of the "essentials" that people now bring on the planes can be easily replaced with safe, airline-issued ones for the duration of the flight.