Unfortunately strong outdoor transmission is documented for Omicron.

38+ people infected by a runner in a park in China, of ~256 he passed that were identified.

https://twitter.com/rdmorris/status/1596978503429525504?s=20...

I’m not sure how divergent evolution of strains is, but there’s enough travel that we probably can’t rule out the threat from a strain that exists anywhere near an active airport.