If you’re desperate to get in on the alpha test for Flight Simulator then head over to the Flight Simulator web-site, log in and update your DXDiag information. Registration opens on the 16th of March and the team will provide an update on the alpha invites on the 19th of March.
The team also report that over 50 companies are now in possession of the SDK so developers can get cracking on add-ons and some are already discussing their roadmaps for development of content for Flight Simulator which as you know 3rd party support is the lifeblood of any civ sim product.