Lights on the wing
Ok, this might be a really daft question, however it's been bugging me for a while now. I've noticed when picking up my boyfriend from work, I watch the planes taking off and I've noticed it out of my window as well that some planes seem to have a flashing light on only one wing, I've seen one with both the other day which just made me wonder more!
Is it just so there isn't just a light but something to show it's a plane, or is there a reason why only one wing?