@Battlingmaxo:
My interpretation is that the fight or clear rule applies to warships only so the fighters would have the option to do either as they can be considered cargo.
Correct. The fighters could stay put and do nothing (remaining cargo), stay put and attack, or leave and attack somewhere else. They could even return to the carrier after attacking somewhere else, as the noncombat move rules for fighters only require that the carrier be friendly, not the sea zone.
@Battlingmaxo:
Lets consider the case of 2 brit infantry on a us transport……they can do neither as they cannot move on their own or offload as the seazone is hostile.
@Emperor:
It is a grey area, but the UK inf would be allowed to conduct an assault on any of the land terrritories bordering sz13 since that is a legal combat move. But they have no way of leaving the seazone or particpating in a sea battle, so they really don’t have an option.
The UK infantry would indeed be stuck on the transport, as they may only conduct an amphibious assault if the sea zone is cleared of enemy surface warships. The only way they could attack is if UK forces cleared the German destroyer. If outside UK forces attacked, any US-carrier-based UK fighters in the sea zone would either have to attack in the sea zone or leave.