Ameritrade is trying to inject the stagnant market with a dose of adrenaline and is using miles to jumpstart activity. Until July 31, Mileage Plus members who deposit $5,000 into their Ameritrade account will earn 5,000 bonus miles. The offer is valid for existing individual or joint accounts. It will take between four to six weeks for the funding to appear in your account and the account must remain open with the minimum additional deposit for six months. Interested investors should make their way to http://www.ameritrade.com/earnmiles/.