ATLANTA — Delta Air Lines said Thursday that it’s on track to contribute nearly $1 billion to its employees’ retirement plans this year, and it is providing some of the funding earlier than previously scheduled.

The world’s biggest airline said that by the end of April it will have contributed $665 million to its traditional pension plans this year, in addition to $100 million that has been contributed to employees’ defined-contribution 401(k) plans.

Another roughly $200 million is scheduled to be contributed to 401(k) plans during the balance of the year.

Delta, based in Atlanta, says its pension funding is normally distributed throughout the year, with the majority of contributions being added near the end.