The airport is just the place you go to after death. We don't know if they went to the same place and I doubt cause Geto would've went to hell. There was no proper burial for Geto and his body is still somewhere out there with Takaba. Kenny is still using it while we have no idea what happened to Gojo's body. Neither of them got a happy ending and most definitely not together :/
So you're a christian I guess. What you said is not a fact and again, them being at the airport means nothing. Even Toji was there. You mean to tell me that guy is going to heaven? We don't know where any of them went but Gojo is too good to go to hell and Geto is too evil to go to heaven. I think even some of the delulu Geto fans can agree that he's evil. Let's be real, they are not together
so sukuna gets his queer happy ending with uraume but gojo and suguru do not