You now have an endless array of mobile services at your disposal to help make your business trips as hassle-free as possible. Most airlines have created apps that allow you to book flights, check in, and get notifications on gate changes and flight delays. But some of the apps' features go above and beyond these basic functions, as part of airlines' strategy to attract new digitally savvy fliers. Here are six of the most useful ones.

1. Airport maps

While most airline apps come equipped with the layout of select airports around the world, the United app has the most extensive collection available, with more than 100 detailed maps. The United app maps are also the most dynamic and include the exact locations of shops, restaurants"¨, and restrooms.

2. Track a bag

Lost luggage will forever be a fear for frequent fliers. Thankfully the Delta app offers a bit of relief with its "Track My Bag" feature, which lets you type in your checked bag number to monitor its location throughout flights and layovers.

3. Book a car

The Southwest app gives you the option to place a car reservation without leaving the app, so your ride is ready and waiting upon your arrival. Meanwhile, the United app recently began to offer equally seamless Uber integration.

4. Passport scanner

Fast and easy check-in options and mobile boarding passes are available for domestic flights. International travel often is a bit more complicated though, so European airline EasyJet has just incorporated a passport scanner into its app. The airline partnered with Jumio on the development of the app and security measures.

5. Get picked up

If you have friends or family meeting you upon your arrival, the JetBlue app has a one-click "Pick Me Up" feature. It emails your loved ones your flight itinerary and driving directions to the airport.

6. Track your flight

Most airline apps allow you to track your flight, but the Alaska Airlines app takes it a step further. Traveling with colleagues on different flights? The app lets you track multiple flights at a time to coordinate arrivals and let you know how long you'll have to wait.