I wouldn't want to risk anything by copy and pasting the e-mail here but it has your reference number, They congratulate you to successfully completing the online video interview and invite you to the f2f group interview. They notify you about which class (training graduation) they are currently hiring for (Hint : it's several months ahead). They warn you that this is not a guarantee of employment nor a conditional job offer and that the interview can take place in any of these cities:
In-person interviews are held in Houston, Chicago, San Francisco and Newark, with the location to be selected by Inflight Services Recruiting.
People who request complimentary arrangements need to be in town for the interview a day ahead and that the a hotel room wont be reimbursed but a flight will be covered.
Then they give you 5 days to chose from for the interview and the phone number to call to reserve the day. You have up until a certain date to get back to them or else you are out.
They finish off with what they need you to bring and they refresh your memory of the eligibility for the position.
I live close to the Newark hub and once they asked me how far I am from there they just gave me an interview there.