The Airship is available in the City Center at level 43.

Quest Steps

Step 1/12:
Train 5 Engineers (University)
Collect 35 Glasses (Summer House)
Collect 34 Chalks (Construction Factory => Concrete Compound)
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Step 2/12:
Collect 6 Reinforcements (Cargo Port)
Collect 28 Springs (Textile Factory => Wool, random drop)
Collect 18 Stars (Club, Concert Hall)

Step 3/12:
Collect 15 Satin flowers (Premium Cottage)
Collect 10 Butterflies (Fruit Farm => Banana)
Ask friends for 12 Paint swatches
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Step 4/12:
Produce 12 lots of Silk (Textile Factory)
Collect 8 Inks (School)
Collect 36 Tubes of glue (Shoe Shop)
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Step 5/12:
Collect 10 Strong ropes (Kindergarten)
Collect 25 Barrows of soil (Farm => Squash)
Collect 12 Crane hooks (Construction Factory => Tile)
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Step 6/12:
Collect 6 Wheels (Auto Repair Shop)
Collect 12 “Fragile!” stickers (Stationery Shop, random drop)
Collect 20 Cabins (Subway Station)
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Step 7/12:
Collect 10 Lenses (Electronics Factory => Web Camera)
Collect 16 Spyglasses (Villa, Villa with a pool)
Ask friends for 15 Compasses
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Step 8/12:
Collect 36 Leather sofas (Colonial House, Hostel, Villa, Villa with a pool, Apartment house, Redbrick house, Skyscraper, Penthouse)
Collect 16 Romantic candles (Coffee House)
Collect 8 Violins (Luxury Apartment)
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Step 9/12:
Collect 30 Hamburgers (Bistro)
Collect 27 Ring cakes (Bakery)
Collect 45 Sandwiches (Pub)​

Step 10/12:
Collect 20 Smoothies (Convenience Store)
Collect 12 Fluffy bunnies (Textile Factory => Velvet)
Collect 8 Heart balloons (City Hall)
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Step 11/12:
Collect 27 Squibs (Recreational cottage)
Collect 12 Fire extinguishers (Water Tower)
Collect 8 Helmets (Hat Boutique)
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Step 12/12:
Collect 22 Musical notes (Museum)
Collect 12 Guitars (Hotel, Apartment house)
Collect 7 Christmas crackers (Administration)
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Your rewards: 1500 coins, 3 XP points, and 4 Superbucks