Dry, cold air
 

On an overnight flight from Atlanta, I experienced a very chilling, dry flight. It was too cold to sleep comfortably without curling up to conserve body heat, and the air was so dry my nose hurt. It was difficult enjoying this flight

its VERY hard to keep everybody comfortable on an aircraft. Your cold, the person next you is warm, the person 3 rows back is cold, the people behind him are hot. Did you mention to the flight attendant that it was cold in the cabin? she could have called up to the flight deck and asked them to adjust the heat (if more were also cold) the pilots usually have the temp set to auto. i always bring a sweater or sweatshirt just in case. As for the air, when your 35,000 ft, the air is always dry up there, thats why flight attendants are always buying lotion