None whatsoever.
And while Delta hasn't contracted out any ramp stations in many years, we've also seen a situation where both above-wing as well as below-wing frontline positions in ACS being back-filled almost exclusively with "Ready Reserves".....as recently as 5-6 years ago the ready reserve program was just as the title implies.....a small group of employees who were essentially at-will employees who would come in and boost staffing in ACS during busy periods throughout the year. They would work with local leadership at their stations to come up with an agreeable work schedule that worked for both the employee and the company.I believe they had to work a minimum of 300 hours per year, though i'm not certain of that number.
That's clearly not how things are done any longer. In many stations throughout the system, including hubs, the "Ready Reserve" program is now a large, and dare i say, critically vital component of staffing as far as ACS is concerned. No longer do ready reserves call up their local Operations Service Manager and give them their available days they can work, but rather, they're required to bid a scheduled line with set days off and set start/stop times based on their seniority. Doesn't exactly fit the definition of a "READY RESERVE", now does it? Gone are the days of simply working a few days per month to reach the minimum 300 hour-per-year threshold. Now the bar has been raised to working up to 1300 hours per year, which itself was raised from 999 hours per year max a few years back.
I can't speak for the hubs, but in the smaller "focus/significant cities" where there is above and below wing employees, the Ready Reserve portion of the workforce has gone from a very small minimal percentage to upwards of 30-50% in many cases in a few short years.