I tried that once, didnt work..with all the time yu spend for security ck , the bus got to Mobay at the same time..sometimes the flights get delayed too. This bus is a coach with a/c and only makes a couple scheduled stops.\There might be flights from Tinson Pen but I imagine it will be expensive
for intra island flights, ck this link

http://www.seejamaicacheaply.com/che...s_jamaica.html