Post covid question for my father.

My father diagnosed and treated for covid at a hospital in chennai. Started with 6/25 and went up to 13/25 and discharged cleared of covid on May 3rd. RTPCR negative on May 17th. Took all blood tests including D Dimer on May 17th and had follow up visit with treating doctor. Took chest Xray, doctor said he is healed all is well. Asked him to take Nintena, doxyfylline, aztolet, Matilda, tenepride, Velez and take chest CT again in 1 month and bring the result alone. My family is coming from abroad and so I have to travel to pune from Chennai to be with them and help them quarantine for 17 days. After that I have to fly to Chennai to pick up my mom and dad to pune and show report to doctor on June 18th. My dad is not on oxygen concentrator anymore and doctoe said he is good and asked him to do breathing exercise and spirometer. 95 and 96 he is maintaining all day. I want to know if my dad can fly with me on 28th May so I can avoid 3 back and forth flight travel. Pls advise.