Landmarks & buildings
Helsinki-Malmi Airport
Helsinki-Malmi Airport is named as a filming location of The Happiest Day in the Life of Olli Mäki by a published source, listed below with its publisher and its sentence. No wiki records a shoot here yet.

From published sources
Newspapers, film offices, archives and city filming permits say these were filmed at Helsinki-Malmi Airport. Each source is linked.
Filming locations nearby
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Towns & cities
Tapanila
Finland · 2 km north-west
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Landmarks & buildings Malmi railway station
Finland · 2 km west
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Towns & cities
Jakomäki
Finland · 2 km north-east
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Towns & cities
Pihlajamäki
Finland · 3 km south-west
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Towns & cities
Viikki
Finland · 3 km south-west
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Landmarks & buildings
Kontula metro station
Finland · 3 km south-east