How mobile-friendly is InterJet?

There is an iOS app from InterJet which will work on your iPhone, iPod, or iPad.

For InterJet Club Interjet members, you'll be able to manage your account from the app, though using their website will no doubt provide more functionality

InterJet has an Android app that works with most Android tablets, phones, and some Android Wear devices. As is often the case, the Android app offers the same functionality as the iOS app.

Also take a look at InterJet's website by clicking here — you should be able to do what you need there.