What airlines have you been flying? I've flown BA, LH, and LX into, out of, and within Europe and online check-in was always available. Not an issue even with budget airlines like Ryanair and easyJet either. The last time I couldn't do anything online was probably a decade ago with Air Koryo or in Myanmar. It's been a while.

I know the bar is pretty low for mainland carriers, but what's not been working right for a long time doesn't make it right or OK now, or less horrible. Otherwise, airlines scoring historically and consistently low in ratings would be superb now?