During the ongoing redevelopment of Belgrade airport I did find myself with a short connection there and unable to find a departure board. I checked the airport website, but it only had the flight names and not gates!

Beginning to get worried and with no-one to talk to in the construction site of an airport I discovered that I needed to rotate my phone and then the extra columns appeared on their website. Yes I had tried scrolling and zooming, but in portrait it wouldn't actually render outside of the visible width.