Tayammum

Assalamu Aalikum, My question is regarding the Tayammum. Now a days, because there is a fear of catching a disease (Covid) by using public places for doing wudu, is it permissible to do Tayammum instead of wudu while traveling on the airports and while traveling intercity. In this case, water is available but there is a fear of catching a disease by using a public toilets specially on airports. Please help with this issue. Regards, Mamoona