Hello! I don't think the roads through the airport are expressways. The wiki lists the following properties for expressways:
*    is a dual carriageway (divided highway, dual_carriageway=yes)
*    has a higher than usual speed limit and accompanying design features, such as motorway-style signage
*    has limited access to abutting properties (access_control=partial), for example via frontage roads and right-in/right-out intersections

These roads through the airport do not match any of those characteristics. Can you please remove those tags?