In fact, the effect you describe is very complex, so there is a whole open source project that allows you to evaluate the actual contrail climate impact for eac

In fact, the effect you describe is very complex, so there is a whole open source project that allows you to evaluate the actual contrail climate impact for each individual flight: https://github.com/contrailcirrus/pycontrails https://github.com/contrailcirrus/pycontrails