Which window is it? Obtaining a ferry permit can be window dependent.
Often we have to ferry aircraft with cracked windshields to an airport where it can be repaired. In a nutshell, a ferry permit allows you to fly a non-airworthy airplane which has been deemed safe by an A&P. The A&P who was called out to the airplane should take care of all the paperwork. If you fly for a 135 operator, the end result will be an open write up in the maintenance log with a ferry permit stapled to it.