Duct tape does not say much. From my experience travelling to/from Europe (some 20 times a year), I can say Aerolíneas safety is as good as at other airlines. What sucks about Aerolíneas is punctuality and on-board service...the flight attendants are uninterested in helping. The same for Iberia and Alitalia.
AirEuropa is always on the brink of collapse. Don't buy tickets in advance...also I would have some worries regarding safety.
The number one has to be LAN, although flying to Santiago means flights to BA take longer.
TAM is also good, but make sure you have dinner before boarding, as food on board SUCKS. Air France is also excellent, and it is sometimes quicker to fly to BA via Paris as to BA via Santiago with LAN.
TAP (via Lisboa) is also good, but it takes two stops from Spain to get to BA.