They sometimes do. That’s why you cannot submit photoshopped/fake flight tickets. They want you to hold the tickets for now and purchase them when your visa is approved. This works if the visa processing takes just a few days (say 2-5 days). Consulates that take longer know that you will eventually get different tickets altogether since your hold/reservation will not be valid for that long.
Based on your approved petition, your spouse and minor unmarried children, younger than 21, may apply for immigrant visas with you. Like you, they must also fill out required application forms, obtain required civil documents, pay the required fees, and undergo medical examinations. Same-sex spouses of U.S. citizens and Lawful Permanent Residents (LPRs), along with their minor children, are now eligible for the same immigration benefits as opposite-sex spouses. Consular officers at U.S. Embassies and Consulates will adjudicate their immigrant visa applications upon receipt of an approved I-130 or I-140  petition from USCIS. For further information, please see our FAQ’s.
I have a few questions on my imminent trip to UK and Europe (traveling on Indian passport). I would be traveling with my parents, both retired and live in India. They are not dependents and have their own source of income. My plan is to first visit UK for 4 days, then travel to France, Switzerland and return to India from Italy. I am currently working as a freelance business consultant, so no ’employer’ as such. In the past I have lived in France for 3 years and have traveled to UK from France on a visitor visa.
Azerbaijan also strictly bans any visit by foreign citizens to the separatist region of Nagorno-Karabakh[633] (the de facto independent Republic of Artsakh), its surrounding territories, and the Azerbaijani exclaves of Karki, Yuxarı Əskipara, Barxudarlı, and Sofulu which are de jure part of Azerbaijan but under the control of Armenia, without the prior consent of the government of Azerbaijan. Foreign citizens who enter these territories will be permanently banned from entering the Republic of Azerbaijan[634] and will be included in their "list of personae non gratae".[635] As of 2 September 2019, the list mentioned 852 people. 
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