N-Numbers
This is the classic tail number search program, but with a twist. This app works in the air, making it the perfect tool for pilots and while at remote airports. The entire FAA registration database (highly compressed) is included in the app - no cell signal or WiFi hotspot needed. And of course, the database can be updated when back on the ground.
View on the App Store
AeroWatch
It's just a quick glance to check for airport delays and stoppages at all commercial airports in the US. Data is retrieved directly from the FAA servers.
View on the App Store
iCOPA
This iPhone app simplifies remote access to the Cirrus Owners and Pilots Association (COPA) forum. The app allows you to view all posts within a specific category, or unread posts across all categories. In addition, you may reply to posts and start new threads. It's the perfect remote companion to keep up to date while on the road (or airways).
View on the App Store
NavMonster
Details TBD.