Hmm, I've also quite some problems on mobile devices.

Also from the office, probably due to a firewall (that causes no problems on all the other sites I often use) I can't use all the input fields/dropdown menus (disregarding which browsers I use). Some dropdown menues don't load and I can't input data in the respective fields.

When I try to use FRA as the code for my Frankfurt airport almost all the time a list with possible meanings appear and if I'm not very precise instead of the intended Frankfurt a tiny airport of Franca is chosen. I don't need that kind of help, it just stops efficient data entry for me.

I would want to use a very basic mobile expertflyer from mobile devices, where I just input airports as 3 letter codes, dates as input without any dropdown menus, and the necessary options as tick-boxes. Fares and airlines just as a list of codes like J, C, D, Z or LH, LX, OS. No graphics, no fancy items.