Have never seen so many at one time flying together.On December 10, 2016, at around 6 p.m., my husband and I observed two lines of planes flying overhead in Santa Fe county. We counted about 8 in one line coming from the South and about 10 in another line coming from the North, flying in formation (a straight line) with equal distance between them. We heard the rumbling of the engines and saw the lights flashing. They were headed in the direction of Los Alamos. We had heard others minutes before we realized and saw that they were planes. Would like to know if anyone else noticed or knows what this was about?((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))