The Airplane Factory - Sling 4 LAA 7 Day build UK flight. Watch while James and Lucien d' Sa fly the recently completed 7 Day build Sling 4 around the UK. Lucien is the proud owner of this sexy new plane and what better way to test it than a 4 up flight arou. Follow along online. The MapShare site shows the progress of someone tracking with an inReach satellite communicator. Read messages they have sent to MapShare. You can even reply.