I live 100 miles north of Wash DC. every evening about sun set 2 fighter jets head due north or due south, very low and rather loud. Occasionally so low, I can smell the exhaust a few minutes after they passed. This past week they have been coming over two at a time in pairs an hour apart in the after noon. So low the house rattles. I am used to them flying high at sunset, but this low roar stuff is getting to me.