Exhibit 10.16

Attachment B To

Letter Agreement No. WJE-PA-05130-LA-2101477

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[***] Certain information in this document has been excluded pursuant to Regulation S-K, Item 601(b)(10). Such excluded information is not material and would likely cause competitive harm to the registrant if publicly disclosed.

Airframe Model/MTOW:

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Configuration Specification:

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2Q21 External Fcst

Engine Model/Thrust:

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Airframe Price Base Year/Escalation Formula:

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Airframe Price:

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Engine Price Base Year/Escalation Formula:

Optional Features:

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Sub-Total of Airframe and Features:

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Airframe Escalation Data:

Engine Price (Per Aircraft):

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Aircraft Basic Price (Excluding BFE/SPE):

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Buyer Furnished Equipment (BFE) Estimate:

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Seller Purchased Equipment (SPE) Estimate:

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Deposit per Aircraft:

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Delivery

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Number of

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Date*

Aircraft

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WJE-PA-05130 SA-2 121450-1F.txt Boeing Proprietary Page 1

Attachment B To

Letter Agreement No. WJE-PA-05130-LA-2101477

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Total:

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WJE-PA-05130 SA-2 121450-1F.txt Boeing Proprietary Page 2