Delta, United, and American Airlines announced purchases of planes on July $18(7/18),$ February $12(\frac{2}{12}),$ and October $7(10/7),$ respectively.

$\backslash$table$[[$Date$,\backslash$table$[[$Delta$],[$Market$],[$Return$]],\backslash$table$[[$Company$],[$Return$]],$Date,$\backslash$table$[[$United$],[$Market$],[$Return$]],\backslash$table$[[$Company$],[$Return$]],$American$],[$Date$,$Return,Return$],[\frac{7}{12},-\mathrm{.}41,-\mathrm{.}61,\frac{2}{8},-\mathrm{.}90,-1\mathrm{.}20,\frac{10}{1},61,41],[\frac{7}{13},\mathrm{.}00,\mathrm{.}31,\frac{2}{9},-1\mathrm{.}00,-1\mathrm{.}20,\frac{10}{2},51,\mathrm{.}81],[\frac{7}{16},1\mathrm{.}09,1\mathrm{.}36,\frac{2}{10},\mathrm{.}51,\mathrm{.}24,\frac{10}{3},1\mathrm{.}21,1\mathrm{.}21],[\frac{7}{17},-1\mathrm{.}09,-\mathrm{.}93,\frac{2}{11},\mathrm{.}71,3\mathrm{.}16,\frac{10}{6},21,-2\mathrm{.}40],[\frac{7}{18},-2\mathrm{.}20,1\mathrm{.}10,\frac{2}{12},-\mathrm{.}41,-\mathrm{.}20,\frac{10}{7},-2\mathrm{.}31,-\mathrm{.}41],[\frac{7}{19},-\mathrm{.}95,-\mathrm{.}55,\frac{2}{15},1\mathrm{.}21,2\mathrm{.}66,\frac{10}{8},\mathrm{.}61,61],[\frac{7}{20},-1\mathrm{.}00,-1\mathrm{.}22,\frac{2}{16},\mathrm{.}61,\mathrm{.}61,\frac{10}{9},-\mathrm{.}41,-19],[\frac{7}{23},\mathrm{.}72,\mathrm{.}31,\frac{2}{17},-\mathrm{.}41,-\mathrm{.}23,\frac{10}{10},\mathrm{.}41,-\mathrm{.}26],[\frac{7}{24},\mathrm{.}21,\mathrm{.}02,\frac{2}{18},41,\mathrm{.}31,\frac{10}{13},\mathrm{.}00,-\mathrm{.}21]]$

Given the above information, calculate the cumulative abnormal return $($CAR$)$ for these stocks as a group. All of the stocks have a beta of $1$ and no other announcements are made. $($A negative answer should be indicated by a minus sign. Leave no cells blank be certain to enter $"O"$ wherever required. Do not round intermediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$