Is the LEGO Ultimate Plane Kit (K10124-1) still collectible?

Yes, as a 2003 Creator Expert item, it holds value for vintage LEGO enthusiasts.

What is the theme of this specific LEGO set?

This set belongs to the Creator Expert theme.

Name: LEGO Ultimate Plane Kit (K10124-1)
Brand: LEGO

Creator Expert

Creator Expert · 2003

Theme · Creator ExpertPieces · 0Set Number · K10124-1Year · 2003

Used

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New / Sealed

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Is the LEGO Ultimate Plane Kit (K10124-1) still collectible?: Yes, as a 2003 Creator Expert item, it holds value for vintage LEGO enthusiasts.
What is the theme of this specific LEGO set?: This set belongs to the Creator Expert theme.
What is the set number for the Ultimate Plane Kit?: The set number is K10124-1.