It seems that most of the airlines flying long haul to Europe are now competing with the low cost airlines such as Europa and Norwegian, allowing hand luggage only and no frills. I noticed this with BA and Iberia, but their flights are significantly more expensive.
Oddly enough, for a flight to London in March, Iberia wanted around AR$14,000 outbound and a staggering AR$30,000 inbound, which I simply don't understand.
BA was around AR$29,500 return, but another AR$3500 for one suitcase. Added to which, BA are still using some rather old Boeing 777s. At least they were when I last flew with them in 2017, but they may have upgraded by now.(they didn't have USB ports when we last flew with them anyway)
Last year we flew Iberia to London Heathrow via Madrid and really enjoyed the amenities of the A380 Airbus, what with good IFE and USB. They had WiFi, but you had to pay for that. I understand most on-board WiFi is Europe and US only at the moment.
I looked into Air Europa, but they don't fly direct to London Gatwick (via Madrid), but they do use the Boeing 787 Dreamliner with all mod cons. Their price was about the same as BA, again without luggage, for which you pay extra.
Then I looked at Norwegian Air, who also run 787 Dreamliners and more importantly, fly direct into London Gatwick. They also turned out to be the cheapest at around US$800, by the time I'd added suitcase, food and seat reservation. Anyway, I booked the flight for an 1130 EZE departure, arriving at the ungodly hour of 0330 at Gatwick, which will be a first for me.
Actually, I'm rather looking forward to experiencing this Dreamliner, as it's said to be a very comfortable ride: higher cabin pressure and quieter inside, apparently making for less jet lag.
Anyway, I'll be flying in early March to see my grandson, so I'll keep you all updated.
Oh and here's the seating plan and the seats I've chosen.