Many Planners can coordinate on a Trip at the same time as Co-Planners, but only one of them can be the Trip Owner.
For Planners that have Teams, the Trip Owner is always the Team Owner.
Your Team Owner is the Trip Owner for all Trips you create.
The Trip Owner is also the Main Contact by default. Unless your Team Owner has set you to be a Main Contact on trips you create.
Main Contact can also be changed for each Trip. If this happens a lot, ask your Team Owner to change your Main Contact Trip Setting, so you are the Main Contact on trips you create.
So why does the Trip Owner matter?
The Owner of a Trip determines the Branding on TripPages
1. The Account Alias used in the Share Trip Link and Magic Links
2. TripPage Logo and Colors