Current Airline Related Data Tools for the U.S.

Airlines for America (A4A) has great resources for current, updated data for airlines. A4A works collaboratively with airlines, labor, Congress and the Administration and other groups to improve air travel.
The AFA data includes Current Operation Status for U.S. Airports, which can be viewed here.  The data includes daily updates on the top 30 U.S. airports by passenger volume, as well as daily airport performance.
Another useful data tool on the site is the Daily Jet Fuel Spot Prices, which shows the Argus Daily composite jet-fuel price for Chicago, Houston, Los Angeles, and New York.  This data can be viewed here.