Aetna and Humana have a plan to preserve competition — but will it be enough?

Humana Inc. and Aetna Inc. have made their case, but will it be enough? According to CNBC News, both insurance companies have reportedly offered to sell off coverage plans to preserve competition, and buyers are already putting in bids. But some analysts think that might not convince the federal regulators who have the final word. "The question is not can you find a buyer for the plans ... but will the government approve the buyer?" Steven Halper, an analyst at FBR Capital Markets, told CNBC.…