The line graph illustrates the number of complaints made to an airline’s complaint department in person, by telephone, by email, or by fax during the first half of 2009.
Overall, the number of complaints filed in person increased sharply over the six months, reaching its highest level at the end of the period. While complaints submitted by telephone also showed an overall upward trend, complaints sent via email or fax, on the other hand, steadily decreased and reached their lowest level.
From January to March, there were various changes in all three types of complaints. Cases filed in person climbed steadily from around 400 to 800. Telephone complaints, although they slightly declined in February, grew again by March, reaching roughly 1,000. In contrast, figures submitted via email or fax remained relatively stable during this period, at approximately 700, with a slight drop in March.
The trends became more evident from April onwards. In-person complaints rose sharply, exceeding 1,200 in April and reaching a peak of around 1,900 by June. Telephone reports also showed a gradual increase across the period, rising from 1,000 to 1,600. In contrast, complaints submitted by email or fax substantially declined, falling to around 350 in May and remaining at their lowest level in June.