Constant Aviation has completed a sixth STC for installing Aircell’s Gogo Biz in-flight Wi-Fi Internet system. This latest approval is for the Citation X and is the MRO’s third STC completed this year. “We are making significant investments in our internal design and engineering department in an effort to better support our STC and modification initiatives. Aftermarket modifications are becoming a business initiative for us and we are focusing on streamlining the STC and FAA approval process by controlling more of the engineering and approval process ourselves,” company president Steve Maiden told AIN.