The apps are touch-and-go. Some are fairly reliable (assuming wherever you are you have decent data connection), others are abyssmal, and none of them seem to b

The apps are touch-and-go. Some are fairly reliable (assuming wherever you are you have decent data connection), others are abyssmal, and none of them seem to be consistent in either regard. I have found, however, if you sign up for SMS updates through most airlines they appear to be quite reliable, and sometimes beat the in-airport departure boards by several minutes, particularly for gate changes.