Firstly surley this should be in the Flybe thread??
Secondly how can you compare prices on different routes?? last time i checked plymouth-gci and nwi-gci are totally different routes!! The airport charges etc can be different. But I suspect the main difference is that Flybe's seats have been on sale for months so therefore more seats sold = higher fares whereas I guess air southwest have just gone on sale so their cheapest fares available?
Last point as far as I can remember flybe have never promised to be cheaper than air southwest on all routes i remember something about offering lower fares on the LGW NQY route only but not an all round pledge.
Am I understanding your post correctly? Seems to have no point to it?
M