Have you noticed that aeroplane food never tastes very good? This may not be the fault of the airline. Many factors affect our sense of taste on flights: Lack of humidity, low air pressure, and 85 decibels of background noise all affect how we experience food and drink. This poses a problem for airlines, who have to modify recipes to include more salt or use more "vibrant flavours". Finnair and digital agency Mirum have come up with a unique audio branding solution.