Inadequate staffing in JAX also. The insourcing of AA metal nearly doubled our flight operation, yet authorized manpower was far short of doubling. In the beginning they added OT shifts. Local management is now trying to eliminate as much of that now as possible. Nine former Envoy employees were hired. One hired permanent FT and eight PT. They have had those eight on temporary FT upgrades since day one. If or when those temporary upgrades expire the operation is sure to implode. We are no longer a destination station but have been listed as a connecting station. Loads of transfer bags, combined with local bags to be run, is labor intensive and takes more time. Four active jet ways and one overflow is only staffed with between 10 - 12 rampers including Leads/Crew Chiefs. We often have 3 - 4 regularly scheduled flights on the ground at the same time. With irregular operations we've had 5. I don't know where Manpower / Staffing comes up with their numbers but I can tell you their math is way off mark. Two employees out on OJI since the cutover and many seeking FMLA for the future. You go from one flight to the next one waiting. The heat of the summer months has not yet arrived but when it does guys will be dropping. The expectation, by the company, to do more with less seems to be a common thread. In the long term; this strategy could be more costly than just providing adequate staffing.