Word of mouth has become a strong promotional instrument and an important source of information effective in consumer's attitudes and behaviors, especially in the field of service where the consumer's believes play an important role in choosing it. Word of mouth is very important in service industries, because intangible products can't be evaluated before consumption. The present study examines the factors effective in the formation of word of mouth about the services of airline companies and their results. The population of the research is all of the passengers used the services of Iran Air Company in the period of conducting the research. The sample size was estimated 212 using Cochran's formula. The convenience sampling plan was used for data collection. Pearson's correlation test and the structural equation modeling were used for testing the hypotheses. Data analysis was conducted using SPSS and AMOS software. Findings show that satisfaction, trust, service quality, the perceived value and loyalty are the factors effective in the formation of word of mouth about airline companies and can directly and indirectly affect on customers' decision about using the services of these companies.
IntroductionToday, presenting new services and using various promotional instruments, airline companies try to obtain a more share of the market and attract more and more passengers to use their services. But some of these instruments are not able to encourage the consumers to use their services, especially in the final decision making stages. People receive information from their environment, mass media and also interaction with other people. Information resulting from interaction with other people about the products and the services is the result of their personal experience or the information received from the employees of the company or other consumers (Silverman, 2001). In an environment where the trust in the organizations and advertising announcements has reduced, word of mouth is a way to obtain a competitive advantage. Word of mouth is a kind of informal communications about the features of an enterprise or a service in the society. The effectiveness in the believes of other people has considerable interests for organizations supplying the products or the services (Sweeny et al, 2007). Word of mouth makes one able to affect on the evaluation and the purchase intentions of similar consumers in terms of information and norms (Bone, 1995). Passengers essentially need information about an airline company and its services to choose it. They always collect information from the mass media including television, satellite, internet, etc. Although the mentioned resources provide valuable information, passengers prefer to receive a huge part of their information from informal resources such as their relatives, their friends, their acquaintances and other people (Silverman, 2001). Since these people are not interested people, they are more noticed by the passengers. It must be mentioned that the formation of positive word...