Kayak offers a flight tracker, a price alert notification service, an airline directory, baggage-fee directory and airport information.

WSJ: To Take the Hassle Out of Traveling, Pack These Apps

Fun game: putting wildly disparate apps like Flight Tracker and Madden NFL in the same folder and seeing what name the system comes up with.

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According to flight tracker Flightstats.com, 85% or more of its flights departed on time from the merged airline's five domestic United hubs by mid-afternoon Monday, and on-time arrivals topped the 90% mark at four of the five airports.

WSJ: Flight Disruptions Ease at United Continental