I was thinking of an app like this and there it was in the App Store! Its great and easy to use.
Some things to consider for a newer version:
1. Stocking the e-mail confirmations as PDF documents just in case there is missing information or if it is needed for proof of something.
2. Programming city stops in the itinerary for those traveling at some point by car to provide a more detailed itinerary.
de_Baltz about WorldMate Travel Plans & Flight Tracker, v4.2.1