I wouldn't use +P ammo if the barrel is not specifically marked for it. Especially in an S&W airlite. I would not be apprehensive about using +P ammo in a Ruger Service Six, however, since it is much more robust. Even tho it is not marked +P on the barrel. +P did not exist when those Rugers were made, at least not mine.
Yes, you can use .38 ammo in a .38 Special firearm as they are compatible with each other.
38 caliber revolver ammo
No
No, and you shouldn't even use. 38 Special ammo in it, either. If it was made in the 1800s, it was probably chambered in .38 Long Colt, and that is the only ammo which is compatible with that revolver.
NO
.38 special Stay away from the "+P" ammo
If you mean +P ammo the answer is no. It is rated for standard pressure ammo only.
.38 S&W. NOT .38 Special, but .38 S&W.
no
38 S&W ammo. which is a shorter version of the 38 special cartridge.
The current production Ladysmith (by Smith and Wesson) fires .38 Special ammo, and can use any factory .38 Special ammo. Do not confuse the current Ladysmith with a tiny .22 caliber revolver made by S&W years ago.
Yes, you can shoot 38 specials through a .357 magnum revolver.