Update: Some offers mentioned below are no longer available. View the current offers here.Citi is a TPG advertising partnerOffer expired February 28, 2011.Citi has been running some pretty bold sign-up offers recently, including the 75,000/100,000 offers that ended Oct 31.Luckily, they’ve launched a new promo thats good until February 28, 2011.75,000 miles when you spend $4,000 in the first 6 months. No annual fee for the first year, $75-$85 thereafter depending on Business vs Personal.Some tips:1) You can apply for both personal and business cards2) Its possible to apply for two personal cards, but you need to submit both applications at the same time. This is risky, but people have been known to get two cards approved. Just make sure you can meet the spend requirements.3) It takes about a week to get your card4) Miles will post a couple days after the statement in which you meet your $4,000 spend.Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.I love AA miles- they can be used on all Oneworld partners, as well as Air Tahiti Nui, Air Pacific, Alaska, El Al, Gol, Gulf, Hawaiian and Jet. They can also be converted into Hilton points at a 1:2 ratio, so this 75,000 offer = 150,000 Hilton points.Safe travels! And if you need help using your newly earned AA miles, feel free to submit a request for my professional award planning services.