'SHOW HISTORY' not available on Mac version?

I have Planefinder on three devices: iPad Air, iPhone6, and Mac Mini. On the iOS devices, on the 'Aircraft' tab, I am given the option of seeing the 'history' of that plane and the previous flights it operated. But on the Mac, using Firefox, I don't seem to be able to do that. Am I missing something obvious, and that function is hidden elsewhere?