An ongoing multibillion-dollar overhaul of the nation's air traffic control (ATC) system is designed to make commercial aviation more efficient, more environmentally friendly and safer by 2025.

But some white-hat hackers are questioning the safety part. The Next Generation Air Transportation System (NextGen) will rely on Global Positioning Systems (GPS) instead of radar. And so far, several hackers have said they were able to demonstrate the capability to hijack aircraft by spoofing their GPS components.

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