$$ \begin{array} {|c|c|c|c|} \hline & \text{On time}&\text{Delayed} &\text{Total} \\ \hline \text{Cosmos Airlines}& 3{,}112 & 345 & 3{,}457 \\ \text{Galaxy Airlines}& 5{,}392 & 1{,}344 & 6{,}736 \\ \hline \text{Total} & 8{,}504 & 1{,}689 & 10{,}193 \\ \hline \end{array} $$

Based on the table above, what fraction of the flights for Cosmos Airlines were delayed?

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The fraction of the flights that were delayed for Cosmos Airlines can be represented by:

$$ \frac{\text{Delayed Cosmos Airlines flights}}{\text{Cosmos Airlines flights}}$$ $$ \begin{array} {|c|c|c|c|} \hline & \text{On time}&\text{Delayed} &\text{Total} \\ \hline \text{Cosmos Airlines}& 3{,}112 & \colorbox{aqua}{$345$} & \colorbox{yellow}{$3{,}457$} \\ \text{Galaxy Airlines}& 5{,}392 & 1{,}344 & 6{,}736 \\ \hline \text{Total} & 8{,}504 & 1{,}689 & 10{,}193 \\ \hline \end{array} $$

Therefore,

$$ \boxed{\frac{345}{3{,}457}}$$