MDWpilot:
No problem. But that's the difference, with such a short flights of 1:30 I don't think you will ever see a large buildup of ice.
The company were I flew the -800 was a charter-company and the duration of most flights was around 3:30 with a max of 4:30- 5:00 at high altitude and sometimes with the fuel temp close to -40°C.
The problem in Europe, as I already posted, is the fuel price. Sometimes the fuel is 50% to even 70% more expensive at destination, so the company policy was always to take eco-fuel with us. The procedure that Wino is talking about came later when we had already several cases of delay after ice-buildup on the upper wing.