Chinese air force aircraft entered Taiwan's air-defense identification zone on 91 days from January to November, according to a Taipei-based think tank. Analysts say Beijing's strategy is more about sending a message to the US and the world than it is an attempt to wear down the Taiwanese military and public. Beijing made a record number of incursions into Taiwan's air defence identification zone last year, but analysts say the hawkish strategy is more a signal to the world than a threat to the island's resolve. The Chinese air force flew over 380 sorties that entered the island's ADIZ on a record 91 days from January to November, according to a Taiwanese government-funded report released last week by the Taipei-based Institute for National Defence and Security Research.