When a company breaks a number out, it is telling you the number matters. RTX's 2020 Form 10-K, the first full-year filing after the Raytheon–United Technologies combination, reports a defense backlog figure and states it 'relates to backlog with government customers and is included within our total backlog.' That sentence is a concentration disclosure dressed as bookkeeping.
The reason it matters in early 2020 is the company's split personality. The merged RTX pairs commercial-aerospace exposure (Pratt & Whitney and Collins) with a defense base (Raytheon). The defense backlog carve-out lets an analyst see how much of the forward runway is government-funded — demand that is appropriations-driven and counter-cyclical — versus commercial-aviation demand that tracks airline capex and flight hours.
Concentration cuts both ways. A heavy government-backlog share gives RTX visibility that pure commercial-aerospace names lack, but it also ties that slice to defense appropriations and program timing. The disciplined read is to track the defense share of total backlog over successive filings: a rising defense share is a de-risking of the commercial cycle; a falling one is the opposite.
Entering 2020, the question is whether the defense base can stabilize a portfolio newly exposed to commercial-aviation volatility. Watch the next several filings for the direction of the government-customer backlog line. Filing on sec.gov; index via EdgarBeast.