Once I’ve put my shoes back on and taken a few deep breaths post-security, I check the time and realize that I have a full hour before I need to board my flight. As a working mother who travels frequently for both business and pleasure, it is rare that I have an hour to dedicate solely to shopping off-line and I am ready to spend. And I’m not talking about magazines and potato chips. Airport retail is morphing from sundries and souvenirs to luxury goods and brand....