In the Name of Allah, the Most Gracious, the Most Merciful.
As-Salāmu ʿAlaykum Wa-Raḥmatullāhi Wa-Barakātuh
In principle, the Adhān and Iqāmah are Sunnah when performing Ṣalāh in a muṣallā at a shopping mall or airport. If the Adhān has already been called at a nearby masjid and can be heard from the muṣallā, that Adhān will suffice, however, it is preferable to call out the Adhān at the muṣallā.
However, if there is no nearby masjid, then the Sunnah of calling the Adhān should be observed before performing Ṣalāh provided no one has called it. This would apply, for example, to an airport muṣallā where there is no nearby masjid and no Adhān can be heard.
The absence of an appointed Imām or Muazzin at the muṣallā does not affect this ruling; any suitable person may call the Adhān and Iqāmah. [1]
And Allah Taʿāla Knows Best.
Baba Abu Bakr
Student Darul Iftaa
Accra, Ghana
Checked and Approved by
Mufti Muhammad Zakariyya Desai
https://iftaa.co.za/9267/is-adhan-required-for-%e1%b9%a3alah-in-a-mall-or-airport-mu%e1%b9%a3alla/