New York – October 27, 2026 -- Timeshifter, maker of the most-downloaded jet lag app, has released a free report arguing that popular jet lag advice and in-flight amenities fail to address the problem and can make it worse, leaving airlines an untapped loyalty lever on long-haul routes.

The report, titled The Arrival Advantage, states that jet lag is a circadian misalignment between the brain's internal 24-hour clock and the local time zone, not a sleep problem. Insomnia and daytime sleepiness are symptoms, Timeshifter says, which is why many products treat it incorrectly. The company names individually timed light exposure and light avoidance as the only science-based fix.

Circadian clock shifts only about one hour per day without intervention

Without intervention, the clock adjusts by roughly one time zone per day. A New York-Dubai trip therefore takes more than a week to fully adapt to, according to the report. A lie-flat seat buys comfort but does not reset the clock. Advice such as sleeping as much as possible on the plane, eating when locals eat, or jogging in the morning can worsen jet lag.

Timeshifter co-founder and Chief Scientist Steven W. Lockley said that "light at the wrong biological time shifts the circadian clock in the wrong direction."

Report outlines four levers for airlines, from personalized plans to crew support

• Personalized plans: sent automatically when a booking crosses three or more time zones. Airlines could gift them to top-tier members, offer them for miles, or sell them as an ancillary at booking.
• Lounge lighting: a small "avoid light" area using bulbs that cost the same as standard ones.
• Cabin lighting: scheduled for the majority circadian profile on each route, with seatback screens showing each passenger's plan.
• Workforce and corporate accounts: circadian planning for crew and ground staff, and jet lag support as part of employers' duty of care.

Loyalty programs reward miles and upgrades but not arrival condition

The report notes that loyalty programs offer miles, lounge access and upgrades, but nothing tied to how members feel on arrival. Timeshifter says several global airlines already apply the science through a partnership with it. The CDC Yellow Book, a reference for clinicians advising international travelers, has featured Timeshifter since 2024.