The line graph gives information about how many complaints were sent to the complaints department of a specific airline from January to June. Overall, the number of complaints sent in person and by telephone increased over a 6-month period, while the opposite trend was true for those complaints sent by email or fax.
The number of complaints sent in person started at over 400 cases, which was the lowest point in general at that time, and then increased steadily to approximately 800 in March. Continuing to rise, this figure reached its highest point of 1900 by the end of the period. Meanwhile, complaints made by telephone had a slight decrease in the first two months but then rose again. This figure remained stable for the next two months then went up significantly and reached the highest point in June at 1600.
Conversely, complaints sent via email or fax began at its peak with 800 cases then dropped gradually until May. In the last two months of the period, this figure remained unchanged.
