Shine ----that's a tuff question as all the required runway length figures that we work with are bashed on accelerate / stop distances for having adequate length to stop in the event of an engine failure right at V1 speed-----and also obsecal clearance with an engine failure at over V1 that would clear 35 feet IIRC--------Probably anything over 5000 ft on an average temp day( a little headwind helps) would get you airborne-----------


With the hiarchies that still exist between military/civilian ------I don't think that we would successfully get it stopped because we can't intercept every 77 headed our way----I don't think the leadership exists in our government(probably no one else except the Isralies)