https://wccftech.com/halo-reach-pc-flight-3-available-now/

Halo Reach PC Flight 3 is available now for the first wave of insiders and includes two campaign missions alongside matchmaking and firefight offerings.

Developer 343 Industries announced the arrival of this final PC flight some days ago but its launch was held back due to some blocking issues in Insider Ring 3. According to the developer, the first wave of invitations has been sent out and more invitations will arrive in the coming days. This final Halo Reach PC flight will be available through November 5.