Cleartrip is one of the popular travel booking (flights,hotel,trains etc) app in India. Earlier this year , Cleartrip brought its app to Windows 10 PCs and tablets. The existing users of Windows Mobile 10 still had to use the Windows Phone 8.1 version on their device.
Now the Cleartrip app is a Universal Windows Platform (UWP) app available on Windows Mobile 10 with the design guidelines of Windows 10.
You can download the app from Windows Store.