http://www.denverpost.com/business/ci_19526368 Satellite broadband is about to go mainstream, offering rural residents true high-speed Internet and millions of suburban dwellers another viable option. Within 18 months, it should be available in-flight for some commercial airline travelers. Douglas County-based WildBlue Communications is behind the transformation of a service that for years has largely been relegated to subscribers in far-flung territories because of its slower speeds and higher costs. WildBlue, a wholly owned subsidiary of Carlsbad, Calif.-based ViaSat, last week began offering 12-megabit-per-second broadband for $50 a month in Colorado. In comparison, WildBlue's existing 400,000 nationwide subscribers are paying $80 a month for 1.5 Mbps service, which is faster than dial-up but hardly sufficient for bandwidth-heavy activities such as downloading music and movie files and streaming video.