calendar changing appointment times!!!

[12Marshall]

Ok, my wife and I are new to the 21st century apparently.
Long story short... wife put a flight time in her appointment and when she went to the mountain time zone from pacific time zone... it changed the time of her appointment and thus (using this @#$%@#$%@#ing calendar as her means of flight time) she missed her flight back costing us dollars.

Is there a better app that doesn't change your appointment times? And why would this be the default... I can't imagine a scenario where I would call a meeting in New York for 12:00 and have it show up as 3pm when i get to new york. It's absurd?

This lovely new phone cost us another $600.