Reason in my head? John Barrowman grew up on lots of American media, and salutes that way automatically, while the rest of the cast just does the open-hand automatically.
Crazy-meta-I-am-a-fan reasons? Ok, here are a few!
1 - Jack, as he was passing for an American, picked it to fit the persona better when he first landed in the 40's, and he's basically kept it as a character piece.
2 - I've always theorized Boeshane is populated by decedents of Americans, through a range of space-colonies, because of the accent. If the accent survived, why couldn't the style of salute? So as a little kid, playing war in the sand dunes, that's what he grew up doing.
3 - That's how they saluted in the Time Agency/whatever war it was Jack served in when he was still in the 51st century. So that's how he salutes. *shrug*
4 - IT'S A SEKRIT TIME TRAVEL SALUTE. THAT'S WHY HE USES IT WITH THE DOCTAH.
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Crazy-meta-I-am-a-fan reasons? Ok, here are a few!
1 - Jack, as he was passing for an American, picked it to fit the persona better when he first landed in the 40's, and he's basically kept it as a character piece.
2 - I've always theorized Boeshane is populated by decedents of Americans, through a range of space-colonies, because of the accent. If the accent survived, why couldn't the style of salute? So as a little kid, playing war in the sand dunes, that's what he grew up doing.
3 - That's how they saluted in the Time Agency/whatever war it was Jack served in when he was still in the 51st century. So that's how he salutes. *shrug*
4 - IT'S A SEKRIT TIME TRAVEL SALUTE. THAT'S WHY HE USES IT WITH THE DOCTAH.