It's not just the CO2, there's more to than that
Often quoted is the 3% that aviation contributes in terms of CO2 to climate change. However, there's more to it than that
Additional emissions include sulphur, nitrogen oxides, particles including black carbon (soot) and water vapour (which in turn can form contrails). Some of these emissions cause extra climate warming high up in the troposphere, and some cause cooling. It's not a simple picture but it's a lot more than 3%