836Although the Republic of Bulgaria submits that cabotage restrictions were lifted for air transport in 1993, it does not, however, set out the reasons why that is relevant in the present case for the road transport sector, when the situation of undertakings operating in different transport sectors is not comparable. The Court has held that the different modes of transport – having regard to the manner in which they operate, the conditions governing their accessibility and the distribution of their networks – are not interchangeable as regards the conditions of their use (judgment of 26 September 2013, ÖBB-Personenverkehr, C‑509/11, EU:C:2013:613, paragraph 47 and the case-law cited).
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