tsa agreed to make changes after aclu filed official complaint .
training will begin at los angeles international airport .
tsa also told aclu the new training will stress ` race neutrality ' and will emphasize ` hair pat-downs of african-american female travelers '
agency said they will also track down pat-down complaints filed by african-american women to assess if discrimination is occurring at specific airports .
in 2012 solange knowles claimed she had been racially targeted for a pat-down because she wore her hair in the afro style .