Website readiness profile · Snapshot 23 October 2026
heathrow.com
heathrow.com's public homepage, certificate and DNS checked against 31 practices and compared with 91 Airlines sites.
- Readiness index
- 79/100
- Ahead of
- 87%
- Practices observed
- 23/31
- Popularity band
- Top 50K
Airlines median 63
of measured Airlines sites
0 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: heathrow.com. Thin bar: Airlines peer median.
Enable
92/100
Peers 74
Harden
83/100
Peers 60
Accelerate
63/100
Peers 56
Recover
0/100
Peers 19
Priority fixes for heathrow.com
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
Modern image formats in use
Observed: The homepage had 31 images and none used WebP or AVIF.
Why it matters: WebP and AVIF are typically much smaller than JPEG or PNG at similar quality, and images are often the heaviest part of a page.
What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.
31% of Airlines peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.
Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format
Priority 2 · Accelerate
No render-blocking scripts in <head>
Observed: The homepage <head> loaded 1 external script without async or defer.
What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.
45% of Airlines peers do this.
Guide: Control Third-Party Scripts Before They Control Your Page
Priority 3 · Enable
Social preview image set
Observed: The homepage had no og:image, so shared links may show without a preview image.
What to do: Add Open Graph tags, including og:image with a 1200 x 630 image.
44% of Airlines peers do this.
Priority 4 · Harden
Certificate lifetime of 100 days or less
Observed: The certificate from DigiCert Inc had a 184-day validity period, longer than the 100-day maximum that applies from March 2027.
What to do: Move to automated issuance and renewal now, while you still have time to test it.
39% of Airlines peers do this.
What heathrow.com already does well
Practices fewer than half of Airlines peers use.
- DNSSEC signedDNSSEC delegation (DS record) present.7.7% of peers
- Referrer-Policy setReferrer-Policy present.25% of peers
- Structured data presentJSON-LD structured data found.30% of peers
What we saw
- Homepage checked
- https://www.heathrow.com/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- DigiCert, 184-day validity, expiring 2026-11-27
- CDN or edge
- Amazon CloudFront, Azure Front Door/CDN
- Platform or framework
- Adobe Experience Manager
- DNS operators
- 1 self-run or other nameserver domain
- HSTS
- max-age 730 days, includeSubDomains
- DMARC policy
- p=reject
- Homepage HTML
- 1,111 KB, br
- Images on homepage
- 31 (jpg 50, png 9, gif 1)
Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.
Stack and providers
Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.
All 31 checks
Select a gap for the method and fix. How each check works
Not observed 8
Observed 23
- HTTP requests move to HTTPS
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- DNSSEC signed
- DMARC policy enforces quarantine or reject
- X-Content-Type-Options: nosniff
- Framing restricted
- Content Security Policy present
- Referrer-Policy set
- HTTP/2 negotiated
- HTML compressed
- Static files cached for 30 days or more
- Offscreen images lazy-loaded
- robots.txt published
- XML sitemap discoverable
- Reachable over IPv6
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Structured data present
- Page language declared
- At most one redirect to the homepage
Own heathrow.com?
Re-run the checks after a change, or verify the site in a free workspace to save reports with history, compare against similar sites and competitors, and track a private action plan. What owners get.
Live status for this site: Status Is Down: heathrow.com. This profile covers configuration only.