Travel v4.2.101
Does United Airlines work on iPhone Duo?
Yes. United Airlines is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
At a glance
- Inner display (7.6″)
- Built for Duo
- Outer display (5.4″)
- Works normally
- Built with
- iOS 27.1 SDK
- Version 4.2.101, read Oct 24, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v4.2.101
- Oct 21, 2026
- Duo in release notes
- Not yet
On the inner display
The app reaches the edges of the inner display. Text and controls stay a comfortable size instead of being blown up.
Apple named it in its iPhone Duo launch roundup on October 22: it moves navigation to the right side of the display.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including United Airlines. Open it on the inner display, then add a second app next to it. You can save the pair and come back to it later.
Duo-specific features
- Adaptive layoutRearranges into sidebars or multiple panes on the inner display instead of just stretching.
- Side toolbarsMoves tab bars and toolbars to the side of the inner display, the new iPhone Duo convention.
Evidence & history
Apple,
Developers bring incredible new app experiences to iPhone Duo (Apple Newsroom)
Apple says it moves navigation to the right side of the display.
App build,
Version 4.2.101 is built with the iOS 27.1 SDK
Apps built with the iOS 27.1 SDK or later can use the whole inner display.
App Store,
App Store listing has screenshots made for iPhone Duo
The developer published 7 screenshots for iPhone Duo’s inner display.
- : Not confirmed yet → Built for Duo — Named in Apple’s iPhone Duo launch roundup
Latest release notes
Version 4.2.101 · Oct 21, 2026
In this release, we’re continuing to focus on streamlining and improving the app to make it easier to use and provide more ways for you to self-serve.
Questions
Does United Airlines work on iPhone Duo?
Yes. United Airlines is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
Does United Airlines work on the outer display?
Yes. iPhone Duo's 5.4-inch outer display behaves like a regular iPhone screen, so every iPhone app works there as usual.
Can I use United Airlines in Split View on iPhone Duo?
Yes. On iPhone Duo every app can be placed side by side with another app on the inner display — developers don't need to opt in. How comfortable it feels at half width depends on the app's layout.