The space shuttle that Marshal Dix takes to Vegan is owned by Pan Universe Airlines, the same company that owned the Mayflower 1 shuttle in Airplane II: The Sequel (1982).
Ted Striker looks out the port window and sees the two crew members floating in space. He turns to his seat partner and says, "Did you see that?" "What?" she says. "There's two crew members out there, look!" The bodies are gone. "I'm afraid there's nothing out there but empty space." the woman says.