After nearly a year of studying air routes in Anchorage airspace, the FAA will soon finalize several proposed changes affecting general aviation operations departing and entering the airspace of local airports. Pilots who use Ted Stevens Anchorage International Airport, Merrill Field, Lake Hood Seaplane Base and other area airports, as well as pilots who transit the Anchorage area without landing, would be affected by the changes. Many of these routes have been in existence for 15 years or more without much change. The new routes may be implemented before summer.