please need help with these, just check which one is false or true. thank youu

14 Identifying the customer is just as difficult and just as important in the leisure air travel market. 15 Within the family, children cannot have any influence on travel buying decisions made by their parents. 16 It is also crucial issue as to whether or not men or women have a greater influence on holiday decision-making. 17 In targeting the leisure air traveler, airlines have no obligations to regard the senior managers and product managers of major tour operators as important customers. 18 It is a truism to say that all customers are different 19 A market segment is a group of customers who have sufficient in common that they form a viable basis for a product/price/promotion combination. 20 All in all, the culture or country of origin of the traveler must be seen as a highly significant segmentation variable in aviation marketing. 21 Today, the possibility of video-conferencing and other forms of electronic communication have not much replaced the need for business air travel. 22 Women are becoming more important in business travel, with forecasts suggesting that by the year 2020 perhaps 30% of all business travel will be undertaken by women