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We've learned that Lightsquared may be back... under a new name. That's right -- An old nemesis to aviation GPS signal integrity made a new appearance this month as a satellite company named Ligado advanced its 5G wireless plan with a questionable approval from the FCC. The company, formerly known as LightSquared, is pushing for permission to begin terrestrial 5G cellular and data service on frequencies it owns that were intended for satellite use. The proposal has caused divisions among government agencies as well as major corporations. It is similar to the plan the company brought forward in 2012, which faced major opposition before being rejected by th