In 2005, LEGO released 4 Duplo Airport sets, all of these sets have been retired. For that year, the total price of all retail sets cost $146, today those sets are valued around $709, a growth of 386%.
Most valuable 2005 LEGO Duplo Airport set
7840 Airport Action Set $337.59
Highest growth 2005 Duplo Airport set
7843 Plane +549.79%
4 sets

7840 Airport Action Set

Theme / Subtheme Duplo / Airport
Year 2005
Pieces / Duplo figures 103 / 5
Availability Retired
7840 LEGO Duplo Airport Action Set
Retail $79.99
Value $337.59
Growth  +322.0%
Annual growth 8.5%

7841 Helicopter Rescue Unit

Theme / Subtheme Duplo / Airport
Year 2005
Pieces / Duplo figures 25 / 3
Availability Retired
7841 LEGO Duplo Airport Helicopter Rescue Unit
Retail $19.99
Value $74.19
Growth  +271.1%
Annual growth 6.8%

7842 Jet Fuel Truck

Theme / Subtheme Duplo / Airport
Year 2005
Pieces / Duplo figures 10 / 1
Availability Retired
7842 LEGO Duplo Airport Jet Fuel Truck
Retail $5.99
Value $37.16
Growth  +520.4%
Annual growth 9.9%

7843 Plane

Theme / Subtheme Duplo / Airport
Year 2005
Pieces / Duplo figures 32 / 2
Availability Retired
7843 LEGO Duplo Airport Plane
Retail $39.99
Value $259.85
Growth  +549.8%
Annual growth 6.9%