Mark Wahlberg -- Sorry for Dissing 9/11 Heroes

Mark Wahlberg is apologizing for saying he could have rewritten 9/11 history, fighting off the terrorists on one of the flights ... and safely landing the plane -- telling TMZ, "To suggest I would have done anything differently than the passengers on that plane was irresponsible."

Mark originally made the comments in an interview with Men's Journal, claiming, "If I was on that plane with my kids, it wouldn't have went down like it did. There would have been a lot of blood in that first-class cabin and then me saying, 'OK, we're going to land somewhere safely, don't worry.'"

But Mark admits he crossed the line -- telling us, "To speculate about such a situation is ridiculous to begin with."