I am traveling to Prague, Vienna, Salzburg and Budapest. Can I fly Mavic air mini2 without permit? It's not for commercial use. Czech Republic CAA is in Czech language which I cannot read.
Since all three countries are part of the EU, they generally follow the EU rules. I'm guessing that a valid drone pilot license from any other EU country + insurance is needed to fly legally.
From what I found on uavcoach.com, you need a permit to fly a drone in the Czech repulic, even if it's just for recreational use. https://uavcoach.com/drone-laws-in-czech-republic/ The Czech CAA does have some info in English, you can find more here: https://www.caa.cz/en/flight-operations/unmanned-aircraft/
Please see this discussion for more details on Prague: How to get a licence to fly a drone in the city of Prague for a week?
Austria has a plainer implementation of the EU drone laws: https://uavcoach.com/drone-laws-in-austria/
Hungary seems to require a special permit for any drone flights, submitted at least 30 days prior to flight: https://uavcoach.com/drone-laws-in-hungary/