Bad weather plagued ULA's launch attempt Amazon throughout a two-hour flight window that opened at 7 p.m. EDT (2300 GMT). Launch controllers worked through some technical glitches, but were primarily concerned thick cumulus clouds and rain within 10 miles of the pad, which violated launch weather rules, ULA officials said.

Amazon’s Project Kuiper broadband communications mega-constellation, a future competitor to SpaceX’s Starlink service, is