flight hours maintenance intervals[15] Model A Check C Check D Check Airbus A220[16] 850 8,500 Airbus A320 family[17] 750 (or 750 cycles or 4 months) 7,500 (or 5,000 cycles or 24 months) 6/12 years ATR 42/ATR 72[18] 750 5,000 2/4/8 years Bombardier CRJ700 series[19] 800 8,000 Bombardier Dash 8[20] 800 8,000 Bombardier Global 7500[21] 850/36 months 8,500 cycles / 12 years Embraer E-Jet family 850 8,500 Embraer E-Jet E2 family 1,000 10,000 Mitsubishi Regional Jet 750 7,500 Boeing 737 NG[22] 150/600 7,500 (or 730 days) Boeing 747-400/747-8[23] 600/1,000 7,500/10,000 6 years (systems) 8/8/6 years (most structures and zonal)