At times, exploration of both of the airships tends to be annoying. This is so, because they are multistory structures and additionally, you often need to deal with narrow pathways, hard-to-find manholes, or containers to move, to get to the collectibles. Below, you can find hints on exploration of the select areas within the Alpha airship. It is a good idea to get to know them, before you start searching for the collectibles.
Many of the collectibles are in the foyer of the Alpha airship (its Eastern part), which is located on the bottom levels of the airship and you may have some problems getting near there. A good idea is to take the main path into the foyer of the cargo compartment. Here, you find the manhole shown in the above screenshot and taking the manhole is the easiest way to get to the lower levels.
In the case of the cargo compartment of the Alpha airship, the most difficult part is the fact that Batman may initially not be able to control the stabilizers of the airship, in order to roll it. For this, you need to find the terminal, shown in the above screenshot, in a small corridor Westwards of the cargo compartment. By default, the terminal is within the range of the turret so, before you hack into it, you need to sabotage the turret. From now on, you can control the stabilizers, while in the cargo compartment.