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delta.com screenshot

Report Summary

  • 1

    Performance

    Renders faster than
    19% of other websites

  • 92

    Accessibility

    Visual factors better than
    that of 80% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 86

    SEO

    Google-friendlier than
    60% of websites

delta.com

Delta Air Lines | Flights & Plane Tickets + Hotels & Rental Cars

Page Load Speed

853 ms in total

First Response

17 ms

Resources Loaded

758 ms

Page Rendered

78 ms

delta.com screenshot

About Website

Welcome to delta.com homepage info - get ready to check Delta best content for United States right away, or after learning these important things about delta.com

Delta Air Lines, a leader in domestic and international travel, offers airline tickets & flights to over 300 destinations in 60 countries. Book direct at Delta.com.

Visit delta.com

Key Findings

We analyzed Delta.com page load time and found that the first response time was 17 ms and then it took 836 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

delta.com performance score

1

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value8.6 s

0/100

10%

LCP (Largest Contentful Paint)

Value34.2 s

0/100

25%

SI (Speed Index)

Value25.1 s

0/100

10%

TBT (Total Blocking Time)

Value42,350 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.674

8/100

15%

TTI (Time to Interactive)

Value58.4 s

0/100

10%

Network Requests Diagram

delta.com

17 ms

www.delta.com

321 ms

157b7bf0dd63120c0d0265eb98f27f913a30d77a1d98e

144 ms

ruxitagentjs_ICA27NVfghjqrx_10259230221142207.js

47 ms

scripts.js

127 ms

Our browser made a total of 19 requests to load all elements on the main page. We found that 37% of them (7 requests) were addressed to the original Delta.com, 42% (8 requests) were made to Content.delta.com and 5% (1 request) were made to Tms.delta.com. The less responsive or slowest element that took the longest time to load (321 ms) belongs to the original domain Delta.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 663.6 kB (74%)

Content Size

892.6 kB

After Optimization

229.0 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Delta.com main page is 892.6 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. CSS take 747.8 kB which makes up the majority of the site volume.

HTML Optimization

-65%

Potential reduce by 15.8 kB

  • Original 24.2 kB
  • After minification 23.5 kB
  • After compression 8.5 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 15.8 kB or 65% of the original size.

JavaScript Optimization

-26%

Potential reduce by 31.6 kB

  • Original 120.6 kB
  • After minification 107.4 kB
  • After compression 89.0 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 31.6 kB or 26% of the original size.

CSS Optimization

-82%

Potential reduce by 616.2 kB

  • Original 747.8 kB
  • After minification 747.6 kB
  • After compression 131.5 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Delta.com needs all CSS files to be minified and compressed as it can save up to 616.2 kB or 82% of the original size.

Requests Breakdown

Number of requests can be reduced by 14 (88%)

Requests Now

16

After Optimization

2

  • JavaScript
  • CSS

The browser has sent 16 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Delta. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

delta.com

delta.com

17 ms

www.delta.com

www.delta.com

321 ms

157b7bf0dd63120c0d0265eb98f27f913a30d77a1d98e

157b7bf0dd63120c0d0265eb98f27f913a30d77a1d98e

144 ms

ruxitagentjs_ICA27NVfghjqrx_10259230221142207.js

ruxitagentjs_ICA27NVfghjqrx_10259230221142207.js

47 ms

scripts.js

scripts.js

127 ms

trackjs.js

trackjs.js

146 ms

fresh-air.css

fresh-air.css

126 ms

variables.css

variables.css

218 ms

fresh-air-fonts.css

fresh-air-fonts.css

34 ms

Bootstrap.js

Bootstrap.js

94 ms

launch-ab7c06f028a9.min.js

launch-ab7c06f028a9.min.js

81 ms

runtime.js

runtime.js

198 ms

polyfills.js

polyfills.js

260 ms

main.js

main.js

197 ms

element.js

element.js

197 ms

NxY

NxY

76 ms

css

css

61 ms

PWV8J-R2M7Y-67AAN-EA9TD-6DRAX

PWV8J-R2M7Y-67AAN-EA9TD-6DRAX

102 ms

CB8837CA379681FED.woff

CB8837CA379681FED.woff

35 ms

Accessibility Review

delta.com accessibility score

92

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

[aria-*] attributes do not match their roles

Best Practices

delta.com best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

delta.com SEO score

86

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Links do not have descriptive text

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Delta.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Delta.com main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

delta.com

Open Graph description is not detected on the main page of Delta. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: