…
If your side (but not necessarily your power) controlled a canal or narrow strait at the start of your turn, you may move
sea units through it (you can’t use it in the same turn that you capture it).
…
You would have to place one Carrier in SZ 6 to collect it.
There is no such thing as a one way mission(suicide). There must be a possible landing space for each air unit or the combat is not allowed.
AAA here on this site allows planes to crash and die sometimes when a valid spot is available. It is an error in the programme.
another example of this in action is attacking an enemy sub. He might (and probably will) submerge, but its up to the defender so the attacker needs to send enough hardware to the sz to win if the enemy defends.