In Bounds?
 

Thrower A1 inbounds the ball to A2. A1 then steps inbounds with one foot and with her other foot still in the air, receives a pass back from A2. Out of bounds violation on A1

What is the ruling?

No violation. Something "inbounds" and nothing "out of bounds" = inbounds.

According to 4-35 Player Location, is A1 inbounds or out-of-bounds?

4.35.2 SITUATION: Thrower A1 inbounds the ball to A2. A2 immediately throws the ball back to A1. When A1 touches the pass, he/she has: (a) both feet touching inbounds; (b) one foot touching inbounds and one out of bounds; or (c) one foot touching inbounds and the other not touching the floor. RULING: The ball remains live in (a) and (c), but A1 has caused the ball to be out of bounds in (b). (4-4-4)

I beat BillyMac to it.

Just to be clear ...
 

And in d) where the inbounder is jumping in with both feet off the floor but hasn't landed anything inbounds yet before receiving the ball?

"All labor that uplifts humanity has dignity." (Dr. Martin Luther King, Jr.)
 

Hey. Some people have to work for a living.

You are where you were until you get where you're going. (NFHS 4-35-3, NCAA 4-36-2, more or less)

y'know, I thought of that just about the moment I turned off the computer for the day ... well after I had left the confines of the keyboard. glad to be confirmed, though. thanks