We had a noon12pm flight got to airport 8:50 because JB window doesn't open until 9 am. Window finally opened at 9:17 and we cleared all lines and at out gat by 9:30 am. Sure we had a long wait but at least we were sitting eating, reading etc not uptight hoping to get to the plane on time.
We usually take this flight and have never had a problem more than the JB window not opening on time.
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