Out-of-towners might be out of luck if they visit New York over the holidays hoping to take a double-decker bus tour of the city. The union that represents guides at Gray Line is threatening a strike when its contract expires this month, according to New York. The guides' chief complaint? Pay, naturally (they make $16.73 an hour; they want it raised to $20). But the guides are also concerned with the harsh working conditions, like having to give tours from the top of a double-decker when it's two degrees outside, and the wind chill makes it even colder since they're standing on top of a bus moving at 30 MPH. But their unhappiness about the frosty work environment doesn't seem to have had an effect on Gray Line's promotional plans. The company is now offering tourists the option to eat a "delectable" meal aboard the bus.