It should be disallowed. It's more anti-competitive conglomeration, and risks the contagion of corruption.

Don't expect it to blocked under our current president. Bolsonaro is basically a Bazilian Trump.

Wasn’t the a ton of whining from the US when airbus bought bombardier?

Yes, there was - but now that Airbus has small planes, Boeing's lineup "needs" to expand to match, and buying a smaller manufacturer is the easiest way to do that.