The third busiest airport by total passenger traffic in the UK behind Heathrow & Gatwick, with aircraft landing or taking off every 3-4 minutes. As an average in 2011 this was 434 movements a day or 158,025 per year
In 2011 18,806,098 passengers landed or flew from the airport which works out as an average of 361,655 per week or 51,665 passengers per day. Taking into account that not all passengers will see your message. If we worked on only 25% of the passengers seeing it, that is still 4,701,524 passengers per year consuming your message for a minimum of at least 10 seconds.