LÖVE

But the problem is the plane moves. Is there a way the x and y coordinates for the bomb to spawn follow the plane?

First, please delete 3 of your 4 posts. (and next time, make sure to see whether your post went on the next page or not )
Second, using a table for the plane's data like for the bombs, you can get the plane's x and y position in the bomb spawning function; so you'll always spawn the bombs where the plane is, even if you moved it.
Edit: apparently i managed to misread the question, sorry about that; look at S0lll0s' answer instead.

Yeah sorry about that. I was a bit confused thank you so much for the help. I will try this later and tell you if it works. I really appreciate your help

or you just update the bombs with their own speed, you set the x-velocity (speed) when you spawn them and add it to the x coordinate every frame. Otherwise if you fly zig-zag the bombs will do that too, which will be pretty weird.