Я пересматривала Звёздные врата SG-1, и так же как всегда сожалела, что Джек и Саманта не вместе, и О! чудо!
В англоязычной википедии нашла это:

"The Sam/Jack relationship was fraught with complications given that he was her commanding officer. Pursuing any sort of relationship would have been inappropriate for both and would only have really been possible late in the series after Jack's retirement. [...] Jack and Sam could have gotten together after Jack's retirement, but it was never made canon because, quite frankly, it wasn't my call. Still, despite the lack of official confirmation, it was only natural that they should get together after the events of Threads and, in my mind, they have been together ever since. An attempt to suggest as much in [Stargate Atlantis'] season 4's Trio unfortunately ended up on the cutting room floor when the episode ran long."

When Carter joins the Atlantis expedition as commanding officer, a framed photo of O'Neill is seen on top of a box of her personal effects. A scene was cut from the Stargate Atlantis season 4 episode "Trio" in which Carter and Dr. Jennifer Keller discuss their love lives. When asked by Keller if she's seeing anyone, Carter initially avoids the question before admitting that "it's complicated" and that the man in question is in Washington D.C but is going to retire soon.

On a different note, Carmen Argenziano, the actor who plays Carter's father Jacob Carter, was asked in an interview who would be a good match for his on-screen daughter. He said:[18]

"I like Daniel Jackson. I felt that Daniel would have been the right choice because Daniel is well educated, is intelligent, gentlemanly and he was everything that I envisioned that my daughter would end up with."

Вкратце: они все-таки вместе, но этого не показали