Douglas DC-3, N431HM and Beech 18's, N21FS and N223CM, are all owned and operated in Switzerland by Hugo Mathys and flown together as the Classic Formation at airshows across Europe. Video and Audio content is Copyright © 2017 S Keeler This video and audio material may not be reproduced in any form (except as the videos Youtube embedded video option on any other website), without written permission.