2 dark objects caught my eye because they descended so quickly and then moved in a straight pattern to the northeast. many aircraft fly over us from direction of the philadelphia airport and then head north but these objects were flying in a strange direction. they were absolutely silent and moving with zero emissions but with haste. they moved as a pair. i was in my pool with my son and the event lasted less than 20 seconds so there was no time to get out and find my phone. unique experience.