Delta Air Lines said on Monday that it has closed $2.1 billion of financing deals that have bolstered its liquidity by $600 million.

The company said the transactions also have addressed more than 40 percent of its 2010 debt maturities.

Delta said the financing deals were secured by liens against its Pacific route authorities, slots and gate leaseholds.

After refinancing $1.5 billion from bank credit and revolving credit facilities of its Northwest Airlines subsidiary, Delta said it will generate $600 million in incremental liquidity.

Atlanta-based Delta, which had announced debt offerings in recent weeks, became the world's largest airline when it bought Northwest last year. (Reporting by Karen Jacobs; editing by Carol Bishopric)