I wouldn't want a software install for a one-time business interaction. I'd expect maybe SMS updates for all of this anyways?

Unless you fly internationally. Text messaging is notoriously unreliable when roaming. Also if they send you a text, there is no guarantee that it isn’t dropped if it doesn’t reach you immediately. Push notifications are a lot more reliable over international data and wifi.

There have been numerous accounts where someone couldn’t use a credit card overseas because their bank tried to send them an SMS that they were suppose to reply to to verify a transaction.

Also, SMS cost a lot more at scale for the sender than mobile notifications.

SMS does not work so well inside planes...

In all the airports i was there were big screens telling you about arrivals and departures and where can you pick up your luggage.

So let’s say I fly out of a busy airport - I do I fly out of Atlanta the worlds busiest airport - you are really going to say that it’s more convenient to find your flight among all the ones that are landing than just looking at your phone?

But even then, you first need to know whether your bag is at Terminal South or Terminal North first.