Qingdao-Jinan high speed rail

I will be arriving at Qingdao Liuting airport at 9.10am on 14 April. Will I be able to catch the 11.36am rail to Jinan? There seems to be hourly departure from Qingdao to Jinan. Should I book the tickets online in advance or can I buy it at the station on arrival? My only concern, if I buy in advance, and there's a plane delay which may cause me to miss it.