HRR and RT are the two routes that have not been updated since they decided to put flags on Pres.Co routes
For some bizarre reason DTG decided not to include the flags with the original releases of the Preserved Collection items. So many people have mentioned it, they are now adding the flags to the Preserved routes. To add the flag would require us to re-download the entire route again (being many gigabytes of data). So DTG are adding the flags at the same time they publish other updates for the same route. So hopefully at some point every route will have its correct flag. There are also many of us hoping that DTG will also upgrade the menu screen to allow us to sort/filter the routes by country, but there is no official confirmation they will do this.