The study of online brand communities is inseparable from the concept of customer engagement. The purpose of this study is to conjoin these two emerging research streams in tourism. Past studies relevant to customer engagement in online communities consider it from only brand perspective, whereas this study considers engagement with brand and engagement with community separately. Social identity and user gratification perspective are used to develop framework in building brand relationship quality. The context of the study is to throw light on benefit of China-Pakistan Economic Corridor (CPEC) on tourism industry in Pakistan. The CPEC is a mega-project between Pakistan and China, worth more than 54 billion US dollars. The Framework was verified using the data collected from several Facebook pages (official and unofficial). This study contributes in understanding the way to enhance brand relationship quality of tourism brand via social media based online communities. This study also validates the customer brand engagement scale consisted of seven dimensions within tourism brand proposed by Dessart, Laurence (2016). The results of this study indicated that community identification has a significant role in engaging customer with community as brand community engagement and with brand as customer brand engagement. Customer brand engagement further enhances brand relationship quality whereas brand community engagement has an insignificant effect on brand relationship quality. This study also provides insight to practical and further research implication.