Some routes 0% cargo

[aceone]

I have some routes that have 0% cargo lf.  Why is that?  I have it set to move both people and cargo.  I have new routes that have some cargo but it seems like some of my other routes that the game gave me don't have any cargo LF.  How can I fix that?  Thanks

[Mort]

If the route is towards the end of the aircraft's range capabilities, it will not have any capacity for cargo (as pax is prioritised).

Which route and aircraft combo?