  A recent analysis of the Supernova Ia data claims a 'marginal'
($\sim3\sigma$) evidence for a cosmic acceleration. This result has been
complemented with a non-accelerating $R_{h}=ct$ cosmology, which was presented
as a valid alternative to the $\Lambda$CDM model. In this paper, we use the
same analysis to show that a non-marginal evidence for acceleration is actually
found. We compare the standard Friedmann models to the $R_{h}=ct$ cosmology by
complementing SN Ia data with the Baryon Acoustic Oscillations, Gamma Ray
Bursts and Observational Hubble datasets. We also study the power-law model
which is a functional generalisation of $R_{h}=ct$. We find that the evidence
for late-time acceleration is beyond refutable at a 4.56$\sigma$ confidence
level from SN Ia data alone, and at an even stronger confidence level
($5.38\sigma$) from our joint analysis. Also, the non-accelerating $R_{h}=ct$
model fails to statistically compare with the $\Lambda$CDM having a
$\Delta(\text{AIC})\sim30$.
