Tranche 1 Transport Layer – Spaceflight Now

September 10, 2025

Breaking News

[ September 10, 2025 ] Live coverage: Space Development Agency, SpaceX to launch next-gen national security satellites Falcon 9
[ September 8, 2025 ] Poor weather halts SpaceX launch attempt of Indonesian communications satellite for second day in a row Falcon 9
[ September 6, 2025 ] SpaceX passes 2,000 Starlink satellites deployed in 2025 with Saturday launch Falcon 9
[ September 4, 2025 ] SpaceX aces 500th Falcon booster landing amid sunrise Starlink mission Falcon 9
[ September 2, 2025 ] SpaceX launches 28 Starlink satellites on Wednesday sunrise Falcon 9 flight Falcon 9

Live coverage: Space Development Agency, SpaceX to launch next-gen national security satellites

September 10, 2025 Will Robinson-Smith

The 21 satellites from York Space Systems are the first in the SDA’s Tranche 1 Transport Layer satellite constellation. SpaceX is targeting liftoff from pad 4 East at Vandenberg Space Force Base at 7:12 a.m. PDT (10:12 a.m. EDT / 1412 UTC).