I'd seen this thread a while back, and I'd been mulling over what I'd do.
Finally found my inspiration this evening - and I'd get every member of the airline board, including myself to a major domestic airport, and make them be there from 6am through to Midday.
Putting them in frontline staff uniform, I'd want them to spend a few hours on check-in and ramp, followed by a few hours surveying passengers and then having them pitch in to clean one aircraft.
Come Midday, there'd be no time to change out of crew uniform as board a flight a flight to Melbourne T1, sitting in Y (and locked out from any upgrade benefits & preferential treatment before and onboard, and none of this waiting in the CL either).
Once they land, they are to go straight to one of the meeting rooms, and all spend the next four hours collaborate on what we saw, how we felt, and what needs to be fixed both now, next week and in the long term. Just for extra torture and passenger experience, a selection of Y meals and on-board coffee/snacks would be brought over for dinner.
The meeting would wrap up around 11pm, where we'd have put everything in place to fix at least one thing each affecting the pax experience before week's end within their area of business expertise. Money to fund moving heaven and earth to make the changes wouldn't be a problem, because I bet half of them would save more money than they cost and make the staff & customer experience a whole lot better.
They'd all have to spend part of the next week working with people and removing any stumbling blocks to make the idea work. One week later, they'd all report back on how each of the initiatives they've been running has worked - followed by selecting one more idea which they get a month to work on.
In short - if you want to see change, then the people at the top need to see why the change needs to be made. The people at the top need to be connected to the business they oversee, and what better way to do that then putting them on the ground, doing and going through exactly what their front-line staff do each and every day.
After all, without the front-line staff doing their job, there's no company to run.