Qatar Airways is the state-owned flag carrier. Its services covered over 140 destinations so you can always find a flight to where you want.
If you are member of the OneWorld Alliance, please be reminded that Qatar Airways is a member of it, which means if you are members of one of these airlines you can also enjoy the facilities of Qatar Airways. Here is a list of OneWorld Alliance members (as of 2015):
Flying from Chicago to Singapore? Why not make a stopover at Doha? You may make a short stay of 2 to 3 days or merely a 8-hour transit, just pop in to say hi to Souq Waqif! Qatar Airways has a easy to use Stopover booking system.