Exhibit 15

July 25, 2023

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Commissioners:

We are aware that our reportdated July 25, 2023 on our reviewof interim financial information of RTX Corporation, which appears in this Quarterly Report on Form 10-Q, isincorporated by reference in the Registration Statementson Form S-3 (No. 333-267564) and S-8 (Nos. 333-234085, 333-234084, 333-228649, 333-225839, 333-197704, 333-175781, 333-150643, 333-125293, 333-110020, and 333-100724) of Raytheon Technologies Corporation.

Very truly yours,

/s/ PricewaterhouseCoopers LLP

Boston, Massachusetts