The longest aeroplanes are categorized by evaluating, from Table 2-1, first their over-all length andsecond, their fuselage width, until 700 movements are reached. It may be seen that the number ofmovements of the longest aeroplanes in the highest category totals only 400. It would appear from 2.1.3 b)above that the minimum category for the airport would be category 6 ; however, even when there is arelatively wide range of difference between the length of the longest aeroplane (Airbus A321) and theaeroplane for which the 700th movement is reached (ATR 42), the minimum category for the airport mayonly be reduced to category 6.