oh its 5 planes? I thought this was some kind of laser that somehow activated the sky's icecrystals like .... sigh .... "chem"trails. (they are not 'chem' trails, they are atmospheric disturbances caused by planes)
Most of them are 5 planes. But you could do this with one plane "printing" out 5 rows of clouds. It could be a drone printing them out very close, or a manned plane further away.