Okay, hear me out.
IF we get rid of masks and SD on 19th July and IF there is no requirement for a 'covid passport' to get into venues, showing either negative test, full vaccination or recent recovery from Covid, that means theatres, cinemas, bars, restaurants, nightclubs, stadiums, all at capacity and with no one knowing who is/isn't vaccinated and who may have Covid, right?
So, if that's the case, why will we still have to wear masks on planes? To get on a plane you generally need a negative Covid test (I know this varies by destination, but many currently do), or proof of full vaccination, plus HEPA filters change ALL the air in the plane every 2-3 minutes. Therefore, you should be pretty damn safe on a plane - much safer than on a train, for instance, or a bus or in any of the venues listed above.
I'm not trying to be goady, this just occurred to me while I was walking round Sainsbury's and thinking '20 more days and I won't have to be wearing this f*ing thing on my face any more'.