This allowed Flight 311 to fly at any altitude above the minimum flight altitude for the Kronoby-Vaasa route, which was . The pilots did not follow these regulations for the last , during which they flew below .
The leniency allowed Flight 311 to take off and land at any altitude above the minimum required height for the Kronoby-Vaasa flight route, which was . However, the pilots failed to observe these rules for the final , during which they flew beneath .