The Delta Air Lines fleet strategy looks extremely messy at first glance. Airbus and Boeing models are both featured in the fleet, and a broad range of brand-new jets and 25-year-old workhorses. Aircraft have multiple cabin standards, and the airline operates a massive in-house maintenance division. The throughline, however, is fairly consistent. Delta Air Lines is trying to grow internationally and in a premium-heavy capacity while lowering overall unit costs and emissions, without betting the company on any single aircraft program. The airline continues to refresh its long-haul backbone with premium-heavy Airbus A350s while keeping a flexible mid-size widebody mix through the Airbus A330 family and existing Airbus A350-900s. The airline is now going to be adding the larger Airbus A350-1000 to the mix as well.