Ok heres the deal.
I have been spotting by ORD the other day. I saw a few nice planes like the 747-200F of AF Cargo, a 744F of SIA Cargo and the A320 Mexicana Retrojet. Well anyways then comes in for a landing a Learjet. It was blinking all of its lights, the next private that i see 30 minutes later is also blinking all the lights while landing. The commercial airliners didnt do this just the private ones.
Can anyone explain why would the private jets were blinking lights while on approach?