The aircraft has been grounded since March.
Ryanair group CEO Michael O'Leary expects the airline to be using the Boeing 737 Max model by summer 2020.
The aircraft has been grounded since March, following the second crash in five months which killed over 300 people in Indonesia and Ethiopia.
The airline is only able to take up to eight deliveries a month.
Speaking to Reuters, Mullingar's Michael O'Leary says Europe will receive it after the US:
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