B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Inflight Event / Encounter Weather / Turbulence
Aircraft; Weather
[While] deadheading in the back of a company airline flight the flight took off with significant wing ice contamination. There was wing contamination and that it continued to adhere to the wing from chassis; takeoff; climb; and cruise phases of flight.
An Air Carrier pilot deadheading in the passenger seating reported the flight departed with icing contamination.