Lizzie Post, the great-great granddaughter of Emily Post, author, and co-host of The Awesome Etiquette Podcast, has agreed to weigh in on a few travel etiquette questions from a politesse perspective. We’ve covered airplane seat backs, reclining, and those pesky armrests; now, how tipsy can you get in the friendly skies? 

http://www.travelandleisure.com/articles/etiquette-plane-drinking