Join Date: Feb 1999
Location: San Jose, California, USA
Programs: AS Plat, UA MM, AA MM, IC Plat, Marriott Gold, Hilton Gold, Hyatt Globalist
Posts: 3,162
This is exactly what TripIt is designed to do.
If you can direct all your email confirmations to the same Gmail account, you can have TripIt automatically add new reservations to your calendar.
It's not exactly the same as connecting it to all your apps, but it's close.