Traceable molecular compounds that find your cabin bag anywhere on board. 3-inch accuracy. Zero panic.
You're on a 747 and realize your passport pouch slid under the seat during turbulence. Instead of the entire flight attendant crew ransacking the cabin while 300 passengers watch, you open the app: it shows your bag's precise location 'Seat 12F, under window seat' with 3-inch accuracy. You reach down and grab it. The person next to you asks, "What IS that?"