This is just an IATA (International Air Transport Association) code. IATA codes are used in aviation to identify and differentiate airports. That’s why a Waterloo Airport flight would often be abbreviated as a ALO flight.
If you book a flight to Waterloo, you will be flying into Waterloo, which is the city’s only airport. Waterloo (ALO) is located 8.5 km from the centre of Waterloo.
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