Yes, this. Is it two different flight numbers? Then you are changing planes. 35 minutes is short BUT if the airline has set up the connection that this would be considered a 'legal' connection, meaning they are providing the minimum connecting time. TBH, 35 minutes is probably the bare minimum. It might not be a bad idea to reach out to the airline and see if there is an alternative. If your first flight is delayed they have to book you on the next available flight but if that isn't until the next day ( and they may compensate you ) it might not be worth it if you are traveling with luggage, strollers, and littles.