Tui at the minute is one big airline humped together with every bit having access to all aircraft as irl, only Tui Belgium operates Embraers yet all have access to them. Would be nice to see them split apart in the future especially if we get older liveries, which I’m hoping for. Also, wrong category, should likely be in discussion or as a suggestion, though I already did one a while back for TUI - [Other] - TUI Airways Group split
If you want to do one for the airports though, make it a separate suggestion post and hopefully it will get added.