**3. Methodology**

#### *3.1. Measurement*

This study has adapted measurement scales from past studies. The items of perceived usefulness and perceived ease of use were adapted from the study of Choe et al. [4]. They adapted both scales from previous studies [69,78] and used them in the context of drone delivery services. Perugini and Bagozzi [79] items were used for the measurement of attitude towards drone delivery service and subjective norms. The measuring items for product processing innovativeness and information processing innovativeness were adapted from the studies of [44,80]. Hwang et al. [67] items were adapted for the measurement of three behavioral constructs: word of mouth, intention to use, and willingness to pay. A five-point Likert scale ranging from 1 = strongly disagree to 5 = strongly agree was used for the measurement of constructs' items. The questionnaire for this study consists of two parts: demographic information of the respondents and questions covering the constructs. The final questionnaire was evaluated by four academic experts from the field of marketing and management. They assessed the content, language, grammar, layout of the questionnaire and proposed minor changes in the wording to meet the purpose of the study. Then the items of the constructs were evaluated by conducting a pilot test on 50 respondents. The results of the pilot test were satisfactory as all factors loading met the minimum threshold value that is 0.70. The items of measuring constructs are given in Table A1.

### *3.2. Data Collection*

The data of the respondents were collected in the restaurants of the five main cities of Pakistan (Karachi, Islamabad, Lahore, Hyderabad, and Quetta). The collection of data was done by the 22 students studying in the final years of MBA and MPhil programs. Before assigning the task of data collection, students were given an online demonstration explaining the process of data collection. Since drone delivery services are not fully commercialized in many countries, respondents, therefore, have little knowledge of drone delivery services. To overcome this problem, first, we asked respondents to watch a oneminute and 56-s video that illustrated food delivery through a drone service (see the link in Appendix A). Then we requested the respondents to fill out the questionnaire. The data collection was started soon after the government announcement of lifting Corona restrictions in the country. It was carried out between 2 August 2021 to 9 December 2021. A total of 672 questionnaires were distributed to the respondents of the study. However, respondents were reluctant to fill out the questionnaires due to their busy schedules and privacy issues. At the end of the survey, we received 383 responses. After discarding the incomplete questionnaires, 361 were validated for data analysis. The response rate was 53.72%.
