I find it very annoying that so many of them (and other corporates) now want you to work primarily through their 'app'. It is far easier to make/review/print bookings on my desktop computer. We are off on EZY soon and their web site was so slow as to time out multiple times. Then the app would not let me log in but would not tell me why. Eventually the website said that I needed to update my passowrd - perfectly reasonable but the app did not know. Once that was done THEN the app did not know about the booking and I had to 'import it'. Other carriers, and my usual car hire company, have the app updated almost as soon as it is done on the website.
When checking in a person, where it had not copied over the passport details, asking for date of birth but not showing what format they want it. These are small things but are the fundamentals of making your pax happy and want to return. I wonder how much of this is further ways of saving costs?