i have seen this a few times . it is green mostly , i thought i seen some blue and some red, it was far away it looked like a thick lineit has been late at night between 10 and 1 in the morning and when the iteam is in the air so is the airforce , so it could be something the airforce has , but just in case i wanted to report it , the iteam dose not move until the planes get near then the iteam disappears, i do hope that it is something that is explainable,