For easier picking of systems to do missons to, i have spent 9001 hours in Paint to come up with the following mockup:

This would be helpful in areas you are not well aquinted with or when the system you need to use has astronomically long names like BD+ 103 435 A etc...
1) You already have [2] missions to Sol, to the same landing
2) You already have [2] missions to Sol, but NOT to the same landing
3) This is a misson to Los, on route to another system you have a mission to. Mouse tooltip gives the system name, in this case Sol
4) This is a misson to Urk, on route to another system you have a mission to, at the same system and landing too.
This would of course be even neater if we could have waypoints with our plotted routes.

This would be helpful in areas you are not well aquinted with or when the system you need to use has astronomically long names like BD+ 103 435 A etc...
1) You already have [2] missions to Sol, to the same landing
2) You already have [2] missions to Sol, but NOT to the same landing
3) This is a misson to Los, on route to another system you have a mission to. Mouse tooltip gives the system name, in this case Sol
4) This is a misson to Urk, on route to another system you have a mission to, at the same system and landing too.
This would of course be even neater if we could have waypoints with our plotted routes.