Heck, they have other employees, re-train some of them for 'temporary duty'.
Years ago the company I worked for could not find/hire enough COBOL programmers to deal with upcoming Y2K problems.
Company offered 6 weeks paid training, and of course a good IT job. Over 2000 of us applied. They took the top 10 of us and it worked so well they grabbed up the next 15 people. That is how I got into IT as a profession. Don't see why they can't do similar for this. Dispatching is probably tough, but not dangerous.