Call 100
Birmingham dropped 'International' from it's title some time ago when they did the re-branding. It's just plain old Birmingham airport now......The Airport management is not exactly pushing for the Station to be renamed to reflect the change
Actually they are, in their recent submission to the transports select committee's enquiry they state the international station should be renamed, to save you wading through it here is the relevant pasage
a)
Rename Birmingham International station "Birmingham Airport" – the station is only two minutes from the Airport on a free air-rail link, but this is not indicated on
www.nationalrail.co.uk, leading to confusion by passengers of the location of the Airport and ease of access by rail. Renaming the station would provide more accurate information to the consumer.