Originally Posted by
Aussie_flyer
Because some of them just aren't that old. Some are younger than certain 777-200s.
The 747s are between 24 and 13 years old:
Boeing 747-4D7 HS-TGO Thai Airways International F10C40Y325 20. Oct 1993 Active
Boeing 747-4D7 HS-TGP Thai Airways International F10C40Y325 22. Nov 1994 Active
Boeing 747-4D7 HS-TGX Thai Airways International F10C40Y325 12. Nov 1997 Active
Boeing 747-4D7 HS-TGY Thai Airways International F9C40Y325 22. Dec 1998 Active
Boeing 747-4D7 HS-TGZ Thai Airways International F9C40Y325 11. May 1999 Active
Boeing 747-4D7 HS-TGA Thai Airways International F9C40Y325 11. May 2001 Active
Boeing 747-4D7 HS-TGB Thai Airways International F9C40Y325 27. Jun 2001 Active
Boeing 747-4D7 HS-TGF Thai Airways International F9C40Y325 03. Oct 2003 Active
Boeing 747-4D7 HS-TGG Thai Airways International F9C40Y325 04. Nov 2003 Active
777-200s not too different:
Boeing 777-2D7 HS-TJA Thai Airways International C30Y279 31. Mar 1996 Active
Boeing 777-2D7 HS-TJB Thai Airways International C30Y279 13. Jun 1996 Active
Boeing 777-2D7 HS-TJC Thai Airways International C30Y279 25. Oct 1996 Active
Boeing 777-2D7 HS-TJD Thai Airways International C30Y279 19. Dec 1996 Active
Boeing 777-2D7 HS-TJG Thai Airways International C30Y279 31. Oct 1997 Active
Boeing 777-2D7 HS-TJH Thai Airways International C30Y279 09. Jan 1998 Active
Boeing 777-2D7(ER) HS-TJR Thai Airways International C30Y262 01. Nov 2006 Active
Boeing 777-2D7(ER) HS-TJS Thai Airways International C30Y262 09. Nov 2006 Active
Boeing 777-2D7(ER) HS-TJT Thai Airways International C30Y262 17. Nov 2006 Active
Boeing 777-2D7(ER) HS-TJU Thai Airways International C30Y262 12. Dec 2006 Active
Boeing 777-2D7(ER) HS-TJW Thai Airways International C30Y262 29. Oct 2007 Active