Rregulators say the $178 million sale didn't get necessary authorization.
Brazil first won its investment-grade credit rating in 2008, so the S&P downgrade is a major setback.
The acquisition, which is expected to close in Q4, is aimed at expanding the Bausch + Lomb's business.
Despite shrinking in Q2, growth picked up for the first time in six months in June.
Sources say Shell has earmarked up to $5 billion for new acquisitions, mainly in Brazil.
It will upgrade existing plants and introduce new technologies, but not open new plants.
The brewer had revenue of about 19 million reais ($5.96 million) last year.
Azul serves the most destinations in Brazil—105—and operates more than 900 daily flights.
The purchase will bring assets in BlackRock’s global infrastructure platform to more than $7 billion.
GE has now finalized $55bn worth of asset sales, with a goal of $100bn this year.