In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

What is fundamental to the function of the airport that has yet to be obtained?, Context: The UK government has spent £250 million in the construction of the island's airport. Expected to be fully operational early 2016, it is expected to help the island towards self-sufficiency and encourage economic development, reducing dependence on British government aid. The airport is also expected to kick start the tourism industry, with up to 30,000 visitors expected annually. As of August, 2015 ticketing was postponed until an airline could be firmly designated.
airline

What residential units have revitalized New Haven?, Context: Since approximately 2000, many parts of downtown New Haven have been revitalized, with new restaurants, nightlife, and small retail stores. In particular, the area surrounding the New Haven Green has experienced an influx of apartments and condominiums. In recent years, downtown retail options have increased with the opening of new stores such as Urban Oufitters, J Crew, Origins, American Apparel, Gant Clothing, and an Apple Store, joining older stores such as Barnes & Noble, Cutlers Records, and Raggs Clothing. In addition, downtown's growing residential population will be served by two new supermarkets, a Stop & Shop just outside downtown and Elm City Market located one block from the Green. The recent turnaround of downtown New Haven has received positive press from various periodicals.
apartments and condominiums

What documents are necessary in criticizing text?, Context: When comparing different documents, or "witnesses", of a single, original text, the observed differences are called variant readings, or simply variants or readings. It is not always apparent which single variant represents the author's original work. The process of textual criticism seeks to explain how each variant may have entered the text, either by accident (duplication or omission) or intention (harmonization or censorship), as scribes or supervisors transmitted the original author's text by copying it. The textual critic's task, therefore, is to sort through the variants, eliminating those most likely to be un-original, hence establishing a "critical text", or critical edition, that is intended to best approximate the original. At the same time, the critical text should document variant readings, so the relation of extant witnesses to the reconstructed original is apparent to a reader of the critical edition. In establishing the critical text, the textual critic considers both "external" evidence (the age, provenance, and affiliation of each witness) and "internal" or "physical" considerations (what the author and scribes, or printers, were likely to have done).
variant readings