The strike will begin tomorrow and is predicted to cause the cancellation of over 1,000 of the 1,950 flights that are scheduled during the period.
A further four-day strike is also set to go ahead from 27 March if the sides are still unable to reach an agreement by that time.
In an attempt to underline the efforts that it is taking to agree a deal with Unite and help minimise disruption to its customers, British Airways has rolled out a series of ad campaigns in recent weeks.
The airline ran a print ad in a number of today's national newspapers, which took the form of an open letter from the airline's chief executive Willie Walsh, assuring customers that the airline would "keep (its) flag flying".
Walsh also appeared in a viral campaign, released by British Airways last week, which attacked the decision by cabin crew to carry out the strike.
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