Let all your friends know that there is a phishing scam using US Airways name. According to the airline, if you receive an email from US Airways, your name and/or confirmation number WILL BE IN THE SUBJECT LINE. If not, it's a scam.
You can always hover the cursor over the link to see the actual destination address. If it's NOT US Airways.com, or other safe site, delete the email. And never, ever open an email, attachment, or link from ANYBODY you do not know.