Original sentence: 19% of A330 operators are already 787 customers though some A330 operators have been dual sourcing from both Boeing and Airbus.Leeham news, on the one hand considers the A330-800 does not really cover the upper end of the middle of the market, on the other hand states that the A330-800 provides Airbus a cost effective entry to the upper hand of the middle of the market.While Airbus believes a market of over 1,000 A330neos, one pessimistic forecast came in as low as 400 sales, in that the A330neo was late to the market and fuel prices has declined markedly over the years, reducing demand
Edited sentence: While Airbus believe a market of over 1,000 A330neos, one pessimistic forecast was as low as 400 sales, in that the A330neo was late to the market and 19% of A330 operators are already 787 customers though some A330 operators have been dual sourcing from both Boeing and Airbus;  the A330-800 does not really cover the upper end of the middle of the market