From the US travel webite. I have
highlighted the relevent information. Type ratings are classed as business travel.
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Which travelers may use the Visa Waiver Program to enter the United States?
Nationals of the 27 countries participating in the Visa Waiver Program
may use VWP if:- The purpose of their stay in the United States is 90 days or less for tourism or business (if in doubt, travelers should check with the nearest Embassy or Consulate to verify that what they plan to do is considered tourism or business.Transit through the United States is generally permitted. Note that foreign media representatives planning to engage in that vocation in the United States are not eligible, as the purpose of their stay does not qualify as “business”. These professionals must obtain a nonimmigrant media (I) visa. See media visa for more information. Also see Visitor Visas – Business and Pleasure;
- They present a machine-readable passport (MRP) valid for six months past their expected stay in the United States (unless country-specific agreements provide exemptions). This includes all categories of passports -- regular, diplomatic, and official, when the traveler is seeking to enter the United States for business or tourist purposes, for a maximum of 90 days
Depending on when VWP travelers’ passports were issued, other passport requirements will apply. Please refer to the
Visa Waiver Program Traveler Guide on the United States CBP website for additional details on this program.