On the second day, Civil Air Patrol aircraft searched but found no trace of wreckage after initiating a complex and expanding search of what later evolved into a nearly 20,000 square miles (52,000 km2) area of some of the most rugged terrain in North America. On the first day of CAP searching, operations were suspended by mid-day due to high winds, according to Ryan. By the fourth day, the CAP was using fourteen aircraft in the search effort, including one equipped with the ARCHER system that could automatically scan detailed imaging for a given signature of the missing aircraft.[54]