Posting this here as I'm in the beginners world. Trying to figure out this game again after years away. I have a 737-300F that will not transport heavy cargo. From what I can tell it should be able to, and I have space allocated for heavy cargo and demand, but it won't transport any. Same thing on 2 routes. One of them I tried setting it to transport cargo only. The 737-400F I have is transporting heavy cargo.
Heavy Cargo - Requires a dedicated freighter aircraft (cargo only) or a combi aircraft that is size class 'Very Large'.
https://manual.airwaysim.com/simulation-documentation/cargo-transportation
--> 737F can't do heavy cargo.
Per your link in manual, a large aircraft can fly heavy cargo. I believe the wording may mean it has to be VL for heavy if it's a combi, like the chart reads. I had a 737-200Adv F flying it in another world. Also have a 737-400F flying it in this world.
Ah, misread the table in a small jetlag. LARGE sizeclass cargo-only plane is needed.
Increase the share of CH in route editor, since if I am not mistaken it now shows zero supply from you side?
Just to update, I had the heavy cargo set for 10% and it was not hauling any. Changed it to 20% and magically started hauling heavy cargo.
there's like a 5k kg minimum or something. So if the % doesn't give 5k or more for that cargo class it's a zero.