United Airlines teamed with Timeshifter, a sleep help app, to assist travelers battling jet lag. Timeshifter outlines the best times to see and avoid light, sleep and either enjoy or pass on caffeine to best avoid jet lag when traveling through time zones. The app is specifically targeted to those traveling across three or more time zones and customizes advice for each passenger based on his or her own sleep preferences and normal sleep pattern, as well as their particular flight.

All MileagePlus members receive access to Timeshifter’s free jet lag plan. Premier 1K MileagePlus members receive access to unlimited Timeshifter plans. Individual, round-trip plans for the Timeshifter app retail at $10 and yearly memberships are $25.

“We want to do everything we can to help improve the experience of traveling across time zones, whether it’s a business trip to Tel Aviv or a vacation to Tahiti, our customers should arrive feeling fresh and ready to hit the ground running,” said Luc Bondar, vice president of loyalty and president of MileagePlus, United Airlines. “Timeshifter takes all the guesswork out of avoiding jet lag and instead uses science and algorithms to design a customized, step-by-step trip across time zones. I was a believer the first time I used the app and I think our customers will love it too.”