After a lot of search here and there, I came to the following solution:
Press and hold control key, and then press AKK.
(Note: second K deletes the empty line).
Actually it is a combination of two commands: Move to Beginning of Paragraph & Delete to End of Paragraph. You may also use/set other key(s) and also may use/set/change key bindings for other command(s) e.g. Move to Beginning of Line & Delete to End of Line. I used the above (default) key bindings as they suited me.
Edit:
To delete more than one consecutive lines, first press and hold control key, and then pressA (just to go to the beginning of the paragraph/line), then press and hold K till all the lines are deleted (this would work as the cursor remains at the beginning).
Just to make task easy (for me), I have set commandD for Delete to End of Paragraph and home/end to go to beginning/end of the paragraph.