Couple of quick questions

Whats the best way to check in with Virgin in US , either DTD or online

firstly where exactly is the Virgin check in at Downtown Disney as I have yet to see it

Secondly can I check in most of my luggage here , and then an additional bag at the airport

reason being we have our kids booster seats with us which I pack into my golf travel bag

so want to check in my main luggage at DTD and then just check my golf bag and kids seats in at the airport

Alternatively if I do online check in with Virgin is it much slower at the airport ??