Deposit $1000 and earn 5000 miles in a month. You still have the $1000 in your account (and it keeps earning miles). This offer ends unless you open your account by Saturday, February 29. Starting March 1 they’ll require a $5000 deposit to earn 5000 miles after account opening.
You’re better off jumping on this before the end of the week, when the offer becomes less generous (but still quite good).