My wife is traveling to USA this Friday by plane.
The air ticket agent is asking her to apply for ESTA online, cost US$39.
But I thought Singaporeans are already under the Visa Waiver Program. So don't really need to apply for visa, or to check for eligibility to enter USA.
Anyone can advice really need to spend the US$39 to get this ESTA.
If not, will there be 'trouble' when at the USA customs?