A ticket isn't required at the right time of the visa application interview. Tourists also can obtain visa through the internet E-Visa. All travelers should know that a visa doesn't guarantee admission into the usa.
See If you have residency (permanent or temporary) in Denmark, you don't have any automated immigration privileges in Greenland, though you can visit for as much as 90 days without a visa even if you're a citizen of a nation that would ordinarily require one. Visas could be stamped or glued directly into a passport for convenience, or else they might be issued on a different bit of paper. Moreover, some laws are also prosecutable in america, irrespective of local law.