I honestly don't think there were gas lines in the buildings. I cannot see any reason to have NG on any of the floors below.
Steam lines, yes. They would heat water, HVAC, etc, for all the tennant needs. Presumably, steam would be made in the basement levels, perhaps even one big plant to serve both towers.
And I think the kitchen for the restaurant was in the basement, and food was whisked up the express elevators, perhaps also involving some kind of IR plate warmers and/or insulated carts.
An electric kitchen would indeed suck it sideways, but could be used for soups and such, and lessen the load on the runners from the basements.
Also, when you read the NIST report, there is absolutely zero mention of gas mains being severed by the plane impacts and adding to the fires, or any mention of safety devices kicking in and preventing that. None.
Just sayin'