Frequent air travelers are no strangers to nightmarish tales about luggage being mishandled or lost during flights. Delta Air Lines tried to ease off the latter earlier this year when it began experimenting with a new online tracking system that allowed passengers to follow their luggage's whereabouts in real time and know which baggage carousel has their bags at the end of a flight. Now, the Atlanta-based carrier has added the feature to its Delta mobile app for iPhone, Android and Windows Phone users.

"Delta's baggage tracking feature on our mobile apps is part of our ongoing investment in technology to bring greater convenience to the travel experience, said Bob Kupbens, Delta's vice president – eCommerce. "We've added features that help put our customer's minds at ease, simplify their journey and put them in control."

The bag-tracking feature works for domestic and international flights, even while you're in-flight, since Gogo's Inflight Internet service will give you free access to or the Delta app. Passengers who have downloaded the app simply need to enter the number on their baggage receipt -- or scan the barcode if using an iPhone -- and they will be provided with an update on the location of their bag.

Granted, you might find out your bag is on the way to Detroit as you fly to LA, but at least you'll be able to go straight to a customer service representative once your plane lands, instead of standing at baggage claim for an hour waiting for your bag just to find out it did not make it.

The Delta app also allows passengers to check-in through their mobile phones, see upgrade and stand-by lists, and provides access to airport maps and aircraft information. A version for BlackBerry devices is available sans the bag-tracking feature, but an update for that platform is coming early 2012.