My parents were returning on a 737-300 Easyjet flight earlier today. Whilst crossing the English channel, (i realise that isnt approach yet!), my parents noticed a small round thing hanging down from underneath the wing on the furthes out spoiler thing that is underneath the wing. Forgive me, I cant remember what those big pieces of metal are called, but you know them, I think the 777 has 3 or 4, and the A310 has 3, and A300 i think has 4.
This small thing was on the 3rd one, (furthest one out on the wing). Does anyone know what it was?