Exactly how many slave-bearing ships flew the Confederate battle flag upon their jackstaffs?
None. That was the Stars and Stripes. The battle flag only flew in fields of war - never upon ships, and upon none bearing slaves from Africa.
Exactly how many slave holding states flew Confederate battle flags as their national flag?
None. Again, that was the Stars and Stripes. The battle flag never flew as a Confederate national flag.
I guess you never heard of The CSS Alabama.
usmcobra is yet another PC-indoctrinated hater of all things southern.
Such a blanket claim is impossible to support. Hundreds of blockade runners flew the confederate flag during the war, making trips to and from Cuba. It's likely that some slaves made the trip back into the confederacy.
And there's this. The most recent issue of "North and South" magazine has an article on confederate privateers. In the article they mention two instances where Northern ships were seized and all the crew removed except for a single black member, the intent being to take the ship back to confederate ports and sell the black man into slavery thus increasing the financial return. The only reason these two examples are mentioned is because in both cases the black crewman overpowered or killed some or all of the confederate prize crew and returned the ship to Northern waters. It is impossible to believe that these were the only cases, so no doubt some prizes, flying confederate flags, took slaves back into the confederacy.
Finally it is well documented that during both the 1862 and 1863 campaigns in the North, the confederate army seized free blacks and took them south to slavery. So unless you want to make a distiction between sailing under the confederate flag or marching under it I fail to see the difference.