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The performance of tourism supply chain (TSC) is robustly tied to efficiency of all entities involved, including the travel agencies. Concomitantly, the efficiency of TSC itself can be obtained through tourism supply chain management (TSCM). This paper goes far beyond the borders of TSC and TSCM concepts and carries out the analysis of relationships between external integration (EI) with transport suppliers and the efficiency of travel agencies. To do so, data envelopment analysis (DEA) and structural equation modelling (SEM) are used. The obtained results showed a noticeable influence of external integration (EI) with water and air suppliers on the efficiency.