Narrative:

Last night I boarded flight X; a B777; flying from ZZZ to ZZZ1. While waiting for the boarding process to begin I noted the weather. The conditions at the departure airport were wintery. There was light snow falling prior to boarding. Earlier in the evening there had been periods of light rain. I noted that this would likely increase the trip time due to de-icing. I boarded the flight and took my seat [in the cabin]. Of note; this seat is located just forward of the left wing. I opened my window shades to see how much snow had accumulated on the wings to get some idea of how long the de-icing operation was going to take. I took a photo on my personal cell phone (attached) and sent it to my wife with a note (attached) that my arrival would likely be later than expected due to the need to de-ice the aircraft.once the door was closed we pushed back as normal. The engines were started; and we began our taxi from gate. I sat back in my seat and tried to unwind from a long day of line flying. As we exited the ramp area I anticipated that we would be headed to the de-ice pad based on our direction of travel. I directed my attention to my personal tablet trying to find a movie to watch for the flight. After a couple of minutes; I looked outside again noting that we were taxiing at a fast pace and then realized we had passed the de-ice pad and were headed for runway xx. At this point I realized the crew was about to depart without de-icing the aircraft. Reaching runway xx we immediately entered the runway and began the takeoff roll. I knew there was nothing I could do at this point other than to document what I was seeing.I watched the rotation through my window noting that some of the snow was being blown off the wing and engine nacelle but much of it remained after liftoff especially on the leading-edge devices. We had; by now; passed the most critical part of the takeoff but I was so shocked that this had occurred it took me several minutes to consider what steps I should now take. I had considered contacting the crew in flight using the cabin interphone but decided that there was nothing to gain by doing so and I didn't want to alarm the cabin crew or passengers. I decided that I would email some of the managers and staff supervisors; as well as the chief pilot office in ZZZ1. During the roll-out I turned off my airplane mode and began to text the operations and maintenance control managers. I again received no reply. Once we parked at the gate I decided to go to the flight deck and talk with the crew. It took several minutes for a clear path to develop. Once I had a clear path to the flight deck I went forward to talk with the crew. Upon reaching the flight deck only the first officer was on board. The captain had already left the aircraft. I introduced myself; handed the first officer (first officer) my business card and began to describe what I witnessed. I showed the first officer the photos on my phone and advised him to file [a report]. I also told him that it was my responsibility to say something and that I would be reporting the event to the chief pilot. During our conversation the first officer told me that during the walk-around one of the ground personnel had told him they had already 'squirted' the airplane. I found this difficult to believe since that is not the procedure in ZZZ.after my conversation with the first officer I was able to talk with the the operations control manager. He advised me to talk with the crew; which I had already done; and to let them know that the chief pilot office would be contacting them; again something I had already done.I believe I have fully captured the events in this report from my point of view; but if you would like to discuss this further feel free to contact me.

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Original NASA ASRS Text

Title: B777 First Officer and a Captain passenger reported being confronted by a fellow Captain flying as passenger regarding deicing.

Narrative: Last night I boarded flight X; a B777; flying from ZZZ to ZZZ1. While waiting for the boarding process to begin I noted the weather. The conditions at the departure airport were wintery. There was light snow falling prior to boarding. Earlier in the evening there had been periods of light rain. I noted that this would likely increase the trip time due to de-icing. I boarded the flight and took my seat [in the cabin]. Of note; this seat is located just forward of the left wing. I opened my window shades to see how much snow had accumulated on the wings to get some idea of how long the de-icing operation was going to take. I took a photo on my personal cell phone (attached) and sent it to my wife with a note (attached) that my arrival would likely be later than expected due to the need to de-ice the aircraft.Once the door was closed we pushed back as normal. The engines were started; and we began our taxi from gate. I sat back in my seat and tried to unwind from a long day of line flying. As we exited the ramp area I anticipated that we would be headed to the De-ice pad based on our direction of travel. I directed my attention to my personal tablet trying to find a movie to watch for the flight. After a couple of minutes; I looked outside again noting that we were taxiing at a fast pace and then realized we had passed the de-ice pad and were headed for RWY XX. At this point I realized the crew was about to depart without de-icing the aircraft. Reaching RWY XX we immediately entered the runway and began the takeoff roll. I knew there was nothing I could do at this point other than to document what I was seeing.I watched the rotation through my window noting that some of the snow was being blown off the wing and engine nacelle but much of it remained after liftoff especially on the leading-edge devices. We had; by now; passed the most critical part of the takeoff but I was so shocked that this had occurred it took me several minutes to consider what steps I should now take. I had considered contacting the crew in flight using the cabin interphone but decided that there was nothing to gain by doing so and I didn't want to alarm the cabin crew or passengers. I decided that I would email some of the managers and staff supervisors; as well as the Chief Pilot office in ZZZ1. During the roll-out I turned off my airplane mode and began to text the Operations and Maintenance Control managers. I again received no reply. Once we parked at the gate I decided to go to the flight deck and talk with the crew. It took several minutes for a clear path to develop. Once I had a clear path to the flight deck I went forward to talk with the crew. Upon reaching the flight deck only the First Officer was on board. The Captain had already left the aircraft. I introduced myself; handed the FO (First Officer) my business card and began to describe what I witnessed. I showed the FO the photos on my phone and advised him to file [a report]. I also told him that it was my responsibility to say something and that I would be reporting the event to the Chief Pilot. During our conversation the FO told me that during the walk-around one of the ground personnel had told him they had already 'squirted' the airplane. I found this difficult to believe since that is not the procedure in ZZZ.After my conversation with the First Officer I was able to talk with the the Operations Control manager. He advised me to talk with the crew; which I had already done; and to let them know that the Chief Pilot office would be contacting them; again something I had already done.I believe I have fully captured the events in this report from my point of view; but if you would like to discuss this further feel free to contact me.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.