Should I say ‘aboard’ or ‘inside,’ ‘aboard’ or ‘into’ in the given sentences?

Should I say ‘aboard’ or ‘inside,’ ‘aboard’ or ‘into’ in the given sentences?

1. Thomas was (aboard, inside) the helicopter. He helped me climb (aboard, inside).
2. Jess was about to climb (aboard, into) the helicopter when a big hand scooped him and slammed him to the ground.