You only ever get one attack.
In the case of ships maintaining multiple
TL on the same target, that means you can spend one to launch your ordnance and then one to reroll, should you choose/need to.
In the specific case of Cluster Missiles, you pay the cost (spend your target lock) and get to perform the attack twice, but that's still technically one attack.
Redline synergises well with Cluster Missiles and Fire Control System, as he gets the original pair of
TL as an action, then spends one to launch the missiles, the second to reroll, then
FCS kicks in as he has performed an attack. His pilot ability means he gains two
TL once again, which means he can again modify the second attack, and after this attack resolves can use
FCS once again, once more taking his
TLs up to two for the next turn.
If he manages to keep the same target in arc, he then attacks again, but as he's not had to spend his action in the Activation Phase acquiring the target lock, he's free to Focus for even more potential damage.
Bit wordy, but there's lots of steps involved!
But, unless an upgrade card or pilot ability permits it (such as Dengar, Corran Horn, Gunner or Luke Skywalker crew) a ship only ever attacks once a turn.
Automatically Appended Next Post: Gah, ninja'd by Peregrine. But my reply was better.