ADDENDUM #1 ITB# 2015-05-001R Concourse A: Passenger Boarding Bridges, A9, A11 and A13 - Part and Install June 1, 2015 1. In order to verify the bridge models, would you provide CAD drawings, showing rotunda sill height and the aircraft mix. If it is not possible, please provide the rotunda sill height for each gate and the aircraft mix each bridge must serve. This is a 2nd story terminal operation. Low rider PBB is not an option. Standard apron drive is required. Layout work has already been done. PBB model required is in the specification.