ABX Air says it plans to lay off another 283 employees at the DHL Air Park over the next week.

ABX spokeswoman Beth Huber said Tuesday these permanent layoffs are in addition to the elimination of 158 jobs that ABX Air announced last week.

The latest cuts include ramp loaders, hardware technicians, sort supervisors and hazardous-materials specialists.

When an employee is laid off, the separation does not go into effect immediately, said Huber. In most instances, a layoff presently means the worker has two weeks remaining of employment, she said.

Although there have been rounds of layoffs announced the past two weeks, that does not mean future layoffs necessarily will come in a similar clockwork fashion, Huber said.

A driving factor determining the timing of layoffs involves ABX tracking the volume of DHL Express freight to be processed at the air park. That’s because ABX wants to retain a sufficient number of workers to keep providing excellent service to DHL, Huber said.

On Nov. 10, DHL Express said it will exit the U.S. domestic freight business and focus on its international packages to and from America.

Pickup and delivery of DHL’s U.S. domestic shipments will end Jan. 30.