forward progress when caught in the air

[PackersFTW]

if the receiver catches the ball in the air at the other team's 9 yard line, but lands both feet down on the 10 yard line. is forward progress given at the 9, or is it at the 10? i would think at the 10, because when you catch a ball in the air, it's not a complete catch yet, you have to establish yourself on the ground, right? i saw a call in the eagles game where this happpened. it wasn't important at all, but he caught it about a yard and a half past the 1st down line, but landed right on the 1st down line, and they spotted it where he caught it in the air, not where he landed after the catch.