Source: Pittsburgh International Airport
According to the ACI-NA survey, airports are adding more nursing rooms for mothers.
Source: Denver International Airport
Smoking lounges at many U.S. airports are being snuffed out.
Source: Chicago Dept of Aviation
Payphones in O'Hare International Airport, circa 1963.
— Harriet Baskas is the author of seven books, including "Hidden Treasures: What Museums Can't or Won't Show You," and the Stuck at the Airport blog. Follow her on Twitter at
@hbaskas
. Follow Road Warrior at @CNBCtravel.