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Artist's commentary
がんばれ小傘さん 504
ESTA is apparently a system that was introduced in 2009. I hadn't even heard of it until I was told about it! :-)
The people in the States told me I had to take care of it 72 hours before traveling, but I input it about 8 hours before, and permission came down in about 5 minutes. Thank God I had a credit card! It cost $14! :-)
By the way, it seems the reason the reservation number didn't come through is that they asked a different person to purchase the ticket, and that person got my email address wrong when they sent the info. I should've confirmed things sooner myself.