Original sentence: At present, there are only 14 such B-17s still flying, with Aluminum Overcast, the high-time leader, logging several thousands of flight hours by 2009 and flying thousands of veterans and aviation enthusiasts.When Aluminum Overcast is on tours flying extensively throughout the USA and Canada, it serves as the EAA's showcase aircraft and visitors can actually walk through the aircraft
Edited sentence: At present, there are only 14 such B-17s still flying, with Aluminum Overcast, the high-time leader, already logging 6,000 flight hours by 1969.During a typical 60-city tour, flights are interspersed with opportunities for visitors to actually walk through the aircraft.The aircraft's annual multi-city tour is scheduled for spring through fall, with maintenance scheduled for the winter months.When Aluminum Overcast is on tours flying extensively throughout the USA and Canada, it serves as the EAA's showcase aircraft and has already flown thousands of veterans and aviation enthusiasts.While the aircraft is about 95 percent authentic, recreating the configuration in 1945 when it rolled off the assembly line, concessions to technological improvements such as a modern radio and avionics suite are incorporated to meet the current air requirements