The only time you'd need someone to bring you a packed suitcase is when you can't go home to get it, don't have time to buy replacements, and will be sleeping on-site. They're asking a spouse to pack things up after normal business hours, because they can't do it themselves.

It does seem unlikely that the airplane maintenance would be within reasonable driving distance of the house, the story would have been clearer and more impactful if they'd said "Fedex a suitcase overnight".