My best Airline Experience was with South African Airways LOS-JNB-LOS a couple of years back, extremely courteuos service and the in-flight entertainment was simply off the hook, I watched at least 5  very new films (altogether)on board that trip,  really cool,

Worst was Bellview to Accra, we were packed like sardines and they kept  stopping at different airports along the way,  and their ground crew for my return leg were unbelievable RUDE !

Lets read your experiences,

Bellview to London via Freetown's my worst experience,

My best experience was KLM and Sabena few years back my worst was Gahna Airways in 94 from Nigeria to Gambia they over booked the flight and i had to sleep at muritala air port for one night trying to catch that flight and then they stopped in every west african country like molue you just opened a closed wound

My best has been Virgin Atlantic. Friendly staff and quite professional. Relaxed attitude and atmosphere.

My worst is a tie Ghana Airways/Ryan Air. Utter rubbish!! no point going into details.