The end result of making a good windshield, is that the glass stays in once piece. 1  A layer of polyvinyl butryal (PVB) is sandwiched between two sheets of glass. 2  Pressure and heat are applied, which chemically and mechanically bonds the outer sheets of glass to the inner plastic layer.
You're probably OK with 90 minutes. I sometimes arrive at my home airport 60 minutes before a flight because I use the expedited security line and because I know where everything is and how long things usually take. But when I'm flying home from an airport that I'm not as familiar with I leave myself more time.
Due to the ease of traveling from FWA, it is only necessary to arrive at the airport 90 minutes prior to scheduled departure time. (If you are flying Allegiant, they recommend 2 hours prior to departure.) Please note, all ticket counters at FWA close Â½ hour prior to departure.