shortage ?
I don't believe there is a shortage now or for quite a while -there are just too many keep folk paying for their tickets (including type ratings) for that to happen, unless the economy dips & reduces cash flows but that would affect demand too so idemand/shortage is directly affected either way
Sorry to be a party pooper but those days of shortages are long gone I fear especially when the pollution taxes kick in & kill the Lo-Co op's long term.