My significant other and I travelled to the USA in late 2015. We made a group ESTA application and it was approved and we went on holiday.
I'm travelling to the States in a week on my own this time, and I'm wondering if I can use the ESTA reference, or if it will be met with confusion as I will be travelling on my own?
Is the group application purely a convenience to register multiple ESTAs (so I'll be fine), or is the group application somehow binding that I have to be travelling in that group for it to be valid (so I'll need my own, individual one)?