A number of major non LCC carriers don't use YPLM as an alternate because mainly due to state regulations requiring certain levels of RFF and approach capabilities. This may exclude it from being an EDTO alternate for planning purposes however once airbourne all bets are off with a major failure. Middle of the day , CAVOK with 3 km of runway and a engine with vibrations strong enough to cause a lot of alarm strewth how much suitable does it need to be !