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\documentclass[12pt]{article}
\usepackage[T1]{fontenc}
\usepackage{mathtools}
\begin{document}
Test
\begin{equation}
\begin{gathered}
\begin{aligned}
\tilde{A} &= {\Omega}^{2} \, A,
&\tilde{B} &= {\Omega}^{- 2} \, B, \\[12pt]
\tilde{\Phi} &= {\Omega}^{w} \, \Phi,
&\tilde{\Psi} &= {\Omega}^{w} \, \Psi,
\end{aligned} \\[12pt]
\tilde{A}_{\mu_1 \, \ldots \, \mu_q}^{\lambda_1 \, \ldots \, \lambda_p} = {\Omega}^{w} \, A_{\mu_1 \, \ldots \, \mu_q}^{\lambda_1 \, \ldots \, \lambda_p}.
\end{gathered}
\end{equation}
\end{document}
aligned
items should be spaced like in the align
environment.Any idea what is going on here?