Anderson Silvaknocked Tito Ortiz out cold, but there's no bad blood between the MMA legends ... 'cause the day after, Spider gave his 1st class plane ticket to The Huntington Beach Bad Boy's GF -- so she could sit with her man.
46-year-old Ortiz posted a video on social media thanking 46-year-old Silva for the sweet gesture.
"The biggest thing I think Anderson Silva has ever done to me, I'm very thankful. He just actually gave up his 1st class ticket for Amber to sit here," Ortiz says.
"The flight's messed up, the airline, Jet Blue, messed up. But, Anderson Silva gave up his seat for Amber to sit next to me."
Tito's GF is Amber Nichole Miller ... one of the original UFC Octagon girls.
Of course, Anderson flatlined Tito towards the end of the 1st round of their Triller fight (full fight replay available on FITE) on Saturday ... catching Ortiz on the ear when a quick, left hook, sending him to the canvas, face first.
Anderson Silva starched Tito Ortiz in 81 seconds in the boxing matchup between former UFC champs. 🕷️