It's currently United Airlines if you are flying from Heathrow and Delta if you are flying from Manchester.

I don't know your flight number yet but you will receive this in your final information a couple of weeks before departure. As long as your ESTA is completed 72 hours before you fly, you will be fine, so there's no hurry.

Kind regards,

Olly, your editor

I am travelling to San Francisco (Golden West) on the 19th September and am trying to update my ESTA details on-line. Could you let me know who we are flying with and the flight number.

Thanks very much

Marilyn