Today's, customer to customer interactions (CCI) has attracted more attention among marketers and they believe that positive interactions are one of the most effective ways to create loyal customers. Current study tries to investigate the effect of customer-to-customer interactions on satisfaction with the firm, loyalty to the firm, and firm word of mouth in airline companies using modified service model of (2005). To collect data, a self-administrated questionnaire was developed. Population is the customers/passengers of Iran Air Company. The sample size was estimated 384 people. Data analysis was based on one-sample t-test and structural equation modeling. Results indicated that: (1) service atmospherics has a significant impact on CCI and firm satisfaction, (2) CCI has a significant impact on firm satisfaction and firm WOM, (3) firm satisfaction has a significant impact on firm loyalty and firm WOM, (4) satisfaction with the service provider has a significant impact on firm satisfaction and loyalty to the service provider, (5) there was no significant relationship between CCI and firm loyalty, and (6) loyalty to the service provider was not related to firm loyalty.