The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Union Coast:
Multi Airline Checkin is an application for passengers to have an easier access to their on the go mobile flight check-in. The application is great for everyone - from business travelers to leisure travelers. A vast majority of US and International airlines are available at your fingertips. You can now check-in to the airline of your choice without the hassle of downloading multiple airline apps. With this app you'll be able to share your itinerary using Twitter or Facebook. The application also gives you the opportunity to track flights. To top it off, you can use our calendar to organize your different travel dates and write notes. Checkin to the following airlines:AA MOBILEAEROFLOT MOBILEAEROLINEAS ARGENTINAAEROMEXICO WEB CHK INAIR CANADA MOBILEAIR CHINAAIR FRANCE MOBILEAIR INDIA WEB CHKINAIRBERLIN MOBILEAIREUROPA WEB CHKINAIRTRAN MOBILEALASKA MOBILEALITALIA MOBILEAUSTRIAN WEB CHK INAVIANCA WEB CHK INCARIBBEAN AIRLINES WEB CHK INCATHAY PACIFIC WEB CHK INCHINA AIRLINESCHINA EASTERNCHINA SOUTHERNCONTINENTAL MOBILE PER MERGER COPA (ITS A TAB)DELTA MOBILEEGYPTAIR MOBILEEMIRATES MOBILEETIHAD AIRWAY WEB CHKINFINNAIR WEB CHK INFRONTIER WEB CHK INHAINAN AIRLINESHAWAIIAN AIR TAB ONLYJAL LOG IN ONLY WEB CHKINJETBLUE MOBILEKLM MOBILEKOREAN AIRLINES ITS TAB ONLYKUWAIT AIRWAYS WEB TAB CHK INLAN MOBILELOT AIRLINES WEB CHKINLUFTHANSA MOBILEQATAR AIRWAYS WEB TAB CHK INROYAL JORDANIAN WEB CHK INSAUDI ARABIAN AIRLINES WEB CHK INSHANDONG AIRLINESSINGAPORE AIRLINES WEB CHK INSOUTH AFRICAN AIRWAY WEB CHK INSOUTHWEST MOBILESPIRIT WEB CHKINSWISS MOBILETACA AIRLINES WEB CHK INUNITED MOBILEUSAIRWAYS MOBILEVIRGIN AMERICAVIRGIN WEBWESTJETRemember to pick up your flight boarding pass from the kiosk or airline representative.