In Chrysogelou's case, she qualified for a visa waiver for her trip to the United States. And while the waiver was valid when she began her trip, the German-based Lufthansa imposes an additional requirement: Passengers must have valid documents for the "entire duration" of their stay. (After I asked Lufthansa about her case, it rescheduled her flights to her original dates.)
To travel to the US visa-free, you must have valid ESTA authorization. Once granted, ESTA is usually valid for a period of two years from the date of issuance. During this time, you can make mutiple trips to the US, provided you remain ESTA-eligibile and provided you reason for travel is permissible under the visa waiver program. If your passport expires prior to the two-year point, your ESTA status will no longer be valid.
Citizens of Canada and Mexico may be eligible for NAFTA Professional (TN) Nonimmigrant status if they work in a qualifying profession. TN status is very similar to H-1B status. To be eligible, you must have a higher education degree, or its equivalent, and a job offer from a U.S. employer. However, if you do not have a degree but have acquired similar skills after working for several years in a specialty occupation, you may also be eligible. Learn more about NAFTA work visas.
A U.S. visa is valid for entry to the United States for the period of time indicated on the visa, even when the passport is expired or no longer valid. You can do this as long as the visa is not damaged, the nationality has not changed, and the terms under which you obtained your original visa have not changed. You will need to carry the passport containing the valid visa together with the new passport when you travel and will need to present both at the U.S. port of entry. The Consulate cannot transfer or reissue an existing visa into a new passport. If your new passport contains a name change, it is recommended you travel with an original copy of your name change or marriage certificate.
Consular section at your nearest embassy or high commission. For UK nationals, India has outsourced its visa application services to VFS Global (www.vfsglobal.com); all applicants must make an appointment to visit an application centre in person. In the USA, India’s visa application services are handled by Cox and Kings Global Services (www.in.ckgs.us).
In general, to obtain a visa it will take four business days. To get a visa in 2-3 business days you can apply for the Express Service (it costs an additional 20 USD); while to get a visa within one business day you can apply for Rush Service (which costs an additional 30 USD). Note that the Rush Service is granted only in documented cases of extreme urgency.
In the event the PPEF was not included in a ticket issued on or after January 1, 2018, it shall remain the responsibility of the airline to transmit the appropriate fee per arriving passenger to the National Treasury. For any tickets sold prior to January 1, 2018, with the passenger arriving and/or departing after January 1st, the BCBP shall continue to collect and charge the same fees totalling Fifty Dollars ($50 USD) upon departure for any airline passenger who arrived in the Republic of Palau prior to the PPEF implementation date and is departing on a ticket purchased before January 1, 2018. The amount collected upon departure in this situation shall be a Thirty Dollar ($30 USD) “Green Fee” and Twenty Dollar ($20 US) departure tax for a total of Fifty Dollars ($50 USD) for every non-Palauan passport holder. Such passenger must provide a copy of their ticket and any other supporting documentation as required.