Most of Flight company fly to Ahmad Yani Airport. So, For up to date flight schedule to Semarang Central Java, you may visit their website by COPY PASTE airlines company name below in new browser.
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http://www.garuda-indonesia.com
http://www.batavia-air.co.id
http://www.mandalaair.com
http://www.merpati.co.id
http://www.lionair.co.id