A hangar, or not having a hangar, that is a question !
Ideal for some nations who don't really have a need to be far from base (Ideal for OPV / IPV / Corvette sized ships), but still having avaition facilities is a pure force multiplier, as it allows so much to be done, from support & transport of EMF, to humanitarian aid.
Having a hangar does have it's benefits, especially in larger ships, but on OPV's it's not a must.
FYI, they are / were getting 3 ships...
... & from info gleened from various sources...
x1, sitting 'complete', that was built in Portsmouth dockyard (by VT / BAE),
x1, About 95% 'complete', (built in Glasgow by BAE) &,
x1 still being built, (in Glasgow) but has been launched, due to be going to sea this year (It should be 'finished by end of Q1, 2011).
Trinidad and Tobago looks to terminate OPV programme
BAE faces £150m hit as Trinidad and Tobago cancels drug-busting patrol ship deal - Telegraph
SA