EWR (Newark) and LEI (Almeria) – the letters appear in order – is it simply that combinations commencing Nxx and Axx were all taken? Any ideas? Also, does anyone know why the likes of Spanair use ambiguous three letter codes (JKK, previously the more logical SPP)?

Spanair’s scheduled designator is JK – I’ve no idea why they changed from SPP but I can only assume that JK and JKK appealed more to them?