Cargo contracts: Simple Quesiton

Am I required to have cargo contracts to fly cargo to and from airports? I’m just starting and building my first airline (for the 20th time lol). If I wanted to fly Chicago to Atlanta would I have to get cargo contracts or build buildings in both areas or would it still ship cargo without?

You do not need cargo or groundhandling concracts. AirlineSim handles everything automaticly.

nope

if your aircraft has got cargo capacity (most medium sized jets[A320s and B737s] have got some cargo capacity available) and the route allows enough payload, your freight capacity will be marketed the same way as passengers are.