Firms recommend OK of airline merger


MINNEAPOLIS — Four advisory firms are recommending that shareholders approve Delta Air Lines Inc.’s proposed purchase of Eagan-based Northwest Airlines Corp.

Shareholders from both companies are meeting separately Sept. 25 to vote on the deal, which would create the world’s largest airline. The carriers also need antitrust approval, which they have said they hope to get by the end of this year.

Glass, Lewis & Co., RiskMetrics Group, Proxy Governance, and Egan-Jones Proxy Services all recommended votes in favor.