Regularly used hotel apps have a strange overabundance of acknowledgements that have not been there before on iPad pro MRT
When you install an app, it typically enables all notifications and banners or asks once and then enabled all of them.

I would go to the settings app on iOS (the settings app from Apple) and select notifications. I like to turn everything off - all the apps, none get a notification until I use the app and decide that I actually want to see notifications.

In your case, you can make a list of all the hotel and travel apps and then just tick them off one by one.