Has anyone had any luck booking these flights on delta.com? I try and it shows the flights but then gives an error.

We are unable to process your request. Please call the Delta Online Customer Support Desk at 1-888-750-3284 for assistance

I called the number and she couldn't book them either and advised to try later.

edit: and when they come back will it be possible to use a delta voucher from a canceled flight to book them?