ESTA Requirements and Emergency Travel.
The widespread civil unrest in Egypt brings into focus problems travelers from Visa Waiver countries may encounter when Internet access for Electronic System for Travel Authorization (ESTA) registration is limited or unavailable. CBP posted ESTA FAQs on October 6, 2010, including a brief discussion of CBP discretionary authority to waive ESTA registration due to emergent circumstances. As waivers of ESTA registration are handled by ports of entry on a case-by-case basis, communicating with CBP at the intended port of entry about the expected arrival(s) is suggested.
The national office of CBP has indicated that it expects CBP offices to be flexible with Visa Waiver Program (VWP) travelers without an ESTA due to emergent circumstances.