Obama signs bill to that aims to modernize aviation system

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President Barack Obama has signed legislation Tuesday that modernizes the nation's aviation system, speeding up the nation's switch from radar to an air traffic control system based on GPS technology. The law also opens up the skies to military, commercial and privately-owned unmanned drones.

The legislation faced opposition from some labor unions because it set new rules governing union organizing elections at airlines and railroads.

The Senate passed the bill last week, completing action after a struggle that shut down the Federal Aviation Administration for two weeks.

Obama signs FAA bill that aims to modernize aviation system